A Conquest of Two Worlds

Introduction

Much early science fiction is often dismissed as formulaic space opera that consisted of nothing more than blasting rockets and blazing rayguns. Substance and social conscience, it is said, did not arrive until the "mature" SF that began to appear in the 60s. Yet, as with most any type of genre fiction, it is a disservice to label the genre with such a broad classification. Case in point: the story presented here.

Edmond Hamilton wrote his share of space opera during his long career and was even given the nickname of "World Wrecker" for the sheer scope of his early work. "A Conquest of Two Worlds", however, reaches beyond its space opera trappings to present a cautionary tale that views the past through a story of the future. Certainly there are the usual rockets, atomic weapons and earth-like environments one would expect from a space opera, but the main theme of the story questions both Manifest Destiny and colonialism. Rather heady stuff for a science fiction story and it is all the more remarkable that it originally appeared in 1932 during the height of the Depression: a time when the thoughts of most authors were on other matters and showing again that Hamilton was first and foremost and author. That he happened to write genre fiction was just the way he made a living.

"A Conquest of Two Worlds" originally appeared in the February, 1932 issue of Wonder Stories.

Bob Gay

February, 2007

Introduction © 2007 by Bob Gay

Editor's Note

Both of the book reprintings of "A Conquest of Two Worlds" lacked a Chapter 1, even though they kept the other chapters in the body of the story. Rather than attempt to insert a first chapter, we have simply followed their lead.

Story

Jimmy Crane, Mart Halkett and Hall Bumham were students together in a New York technical school in the spring when Gillen's flight changed the world. Crane, Halkett and Bumham had been an inseparable trio since boyhood. They had fought youthful foes together, had wrestled together with their lessons, and now read together, as an amazed world was reading, of Ross Gillen's stupendous exploit.

Gillen, the stubby, shy and spectacled Arizona scientist, burst the thing on the world like a bombshell. For sixteen years he had worked on the problem of atomic power. When he finally solved that problem and found himself able to extract almost unlimited power from small amounts of matter, by breaking down its atoms with a simple projector of electrical forces of terrific voltage, Gillen called in a helper, Anson Drake. With Drake he constructed an atom-blast mechanism that would shoot forth as a rocket stream, exploded atoms of immeasurable force, a tremendous means of propulsion.

For Gillen meant to conquer space. Through that momentous winter when Crane, Halkett and Bumham had not a thought beyond their school problems and school sports, Gillen and Drake were constructing a rocket that would use the atom-blast mechanism for propulsion and could carry one man and the necessary supplies of air, food and water. There was installed in the ship a radio transmitter they had devised, which made use of a carrier-beam to send radio impulses through the earth's Heaviside Layer from outer space. When all was ready Ross Gillen got calmly into the rocket and roared out into space to eternal glory.

Crane, Halkett and Bumham read as tensely as everyone else on earth the reports that came back from Gillen's radio. He swung sunward first and reported Venus a landless water-covered ball, and Mercury a mass of molten rock. Landing was impossible on either. Then Gillen headed outward in a broad curve for Mars and on a memorable day reported to earth a landing on that planet.

Mars had thin but breathable air, Gillen reported. It was an arid world of red deserts with oases of gray vegetation wherever there were underground springs or water-courses. There were Martians of some intelligence moving in nomadic groups from oasis to oasis. They were man-like beings with stilt-like legs and arms, with huge bulging chests and bulbous heads covered with light fur. Gillen said the Martian groups or tribes fought some among themselves with spears and like weapons, but that they welcomed him as a friend. He reported signs of large mineral and chemical deposits before he left Mars.

Gillen's radio signals became ever weaker as his rocket moved through space toward Jupiter. He managed a safe landing on that pant planet and found it without oceans, warm and steamy and clad from pole to pole with forests of great fern growths. A strange fauna inhabited these forests and the highest forms of life, the Jovians, as Gillen called them, were erect-walking creatures with big, soft hairless bodies and with thick arms and legs ending in flippers instead of hands or feet. Their heads were small and round, with large dark eyes. They lived peacefully in large communities in the fern forests, on fruits and roots. They had few weapons and were of child-like friendliness. Gillen stayed several days with them before leaving Jupiter.

Gillen said only that Jupiter's greater gravitation and heavy wet atmosphere had made him ill and that he was heading back to earth. Saturn, Uranus, Neptune and Pluto were, of course, hopelessly cold and uninhabitable.

Crane, Halkett and Bumham were part of a world that was mad with excitement as Gillen swung back through space toward earth. And when at last Gillen's rocket roared in through earth's atmosphere and landed, it smashed, and they found Gillen inside it crumpled and dead, but with a smile on his lips.

To Halkett, Crane and Bumham, Gillen was the supreme hero as he was to all earth. Overnight, Gillen's flight, the fact of interplanetary travel, changed everything. The new planets open to earthmen brought new and tremendous problems. Even as Anson Drake, Gillen's helper, was supervising construction of ten rockets for a second expedition, the world's governments were meeting and deciding that a terrific war between nations for the rich territories of Mars and Jupiter could only be avoided by formation of one government for the other planets. The Interplanetary Council thus came into being and one of its first acts was to make Drake's expedition its official exploring party.

Drake's expedition became the goal of all the adventure-minded young men of earth. Jimmy Crane, Mart Halkett and Hall Burnham were among these, but they had what most of the adventurous had. not, technical education and skill. The harassed Drake took the three on: and when Drake's ten rockets sailed out with the commission of the Interplanetary Council to explore Mars' mineral and other resources, to establish bases for future exploration on Mars and if possible on Jupiter, Crane, Halkett and Burnham were together in Rocket 8.

Drake's expedition proved a classic in disaster. Two of his ten rockets perished in mid-space in a meteor swarm. Many of the men in the other rockets were struck down by the malign combination of the weightlessness, the unsoftened ultra-violet rays, and the terrific glare and gloom of mid-space. This space-sickness had put about a half of Drake's men out of usefulness, Halkett and Burnham among them, when his eight rockets swung in to land near the Martian equator.

One of Drake's rockets smashed completely in landing, and three others suffered minor damages. They had landed near one of the oases of vegetation, and Drake directed the establishment of a camp. The thin cold Martian air helped bring his space-sick men back to normal, but others were being smitten at the same time by what came to be known later as Martian fever. This seized on Hall Burnham among others, though Halkett and Crane never had it. The fever came as the result of the entirely strange conditions in which the earthmen found themselves.

Drake's men were in a world in which nothing could be measured by terrestrial standards. The reduced gravitation made their slightest movements give grotesquely disproportionate results. But the thin air made even the slightest effort tire them quickly. The sun's heat was enough by day to give moderate warmth, but the nights in Drake's camp were freezing. Halkett, Crane and Burnham marveled at the splendor of those bitter nights, the stars superb in frosty brilliance, the two Martian moons casting ever-changing shadows.

Then, too, there were the Martians. The first contact of Drake's party with them was amicable enough. The big, furry man-like beings, strange looking to the earthmen with their huge expanded chests and stilt-like limbs, emerged from the vegetation oases to greet Drake's men as friends. News of Gillen's visit had traveled over part of Mars, at least, for these Martians had heard of it.

Drake welcomed the Martians and ordered his men to fraternize with them, for he hoped to learn much from them concerning the planet's resources. He was beginning to see that his expedition was far too small for even the sketchiest exploration of the planet. So Martians and earthmen mixed and mingled in the little camp at the oasis' edge. Some of the men learned the rudiments of the Martians' speech — Mart Halkett was one of these — and got from them a little information concerning location of mineral deposits. Although most of it was undependable, still Drake felt he was learning something.

But the whole state of affairs changed when one of Drake's men foolishly told some Martians that Drake's expedition was but the forerunner of many others from earth, and that the Interplanetary Council would direct the destinies of all the planets. It must have been a shock to the Martians, primitive as they were, to find that they were considered subjects of this new government. They withdrew at once from the earthmen's camp. Drake radioed to earth that they were acting queerly and that he feared an attack.

Yet when the attack came three days later the earthmen brought it on themselves. When one of Drake's guards wantonly slew a Martian, the natives rushed the camp. Drake had hastily made ready atom-blast mechanisms for defense and the attacking Martians were almost annihilated by the invisible but terrific fire of disintegrated atoms. Crouching behind their rude dirtworks, the earthmen, even those staggering from Martian fever, turned the roaring blasts this way and that to mow down the onrushing mobs of furry, big-chested stilt-limbed Martians. Halkett, Crane and Burnham did their part in that one-sided fight.

The Martians had learned their lesson and attacked no more but hemmed in the camp and systematically trailed and killed anyone venturing from it. More of Drake's men were going down with Martian fever and several died. Exploration was out of the question and Drake's position became insupportable. He reported as much and the Interplanetary Council ordered his return to earth.

Drake foolishly sent four of his rockets, with Halkett and his friends in one, back to earth in advance. The other three and their crews, including himself, delayed to repair the damage done in landing. The Martians rushed them in force that night, and Drake and all his men perished in what must have been a terrific battle.

Halkett, Crane and Burnham got back to earth with the four advance rockets some time after Drake's last broken-off radio-messages had told his fate. They found earth, which welcomed them as heroes, wrathful at the slaying of their commander and comrades by the Martians. The information Drake had sent back regarding Mars' rich chemical and metallic deposits added greed to the earth-people's anger.

Announcement was made immediately by the Interplanetary Council that another force would be sent back to Mars, one better equipped to face Martian conditions and powerful enough to resist any Martian attack. It was evident that the Martians would resist all explorations and must be subdued before a systematic survey of the planet could be made. Once that was done. Mars would become a base for the exploration of Jupiter.

Rockets to the number of a hundred were under construction, embodying all the lessons Drake's disastrous expedition had learned. Instruments, to give warning of meteor swarms by means of magnetic fields projected ahead, were devised. Walls and window ports were constructed to soften the terrific ultra-violet vibrations of free space. Special recoil harnesses were produced to minimize the terrible, shocks of starting and landing. These would reduce space-sickness, and Martian fever was to be combatted by special oxygenation treatment to be given periodically to all engaged in this new venture.

Weapons were not forgotten — the atom-blast weapons were improved in power and range, and new atomic bombs that burst with unprecedented violence were being turned out. And while crews were being enlisted and trained for this rocket fleet, the Army of the Interplanetary Council was organized. Most of the survivors of Drake's disastrous expedition joined one department or another of the new force. Crane, Halkett and Burnham had joined at once, and because their Martian experience made them valuable they were commissioned lieutenants in the new army.

Halkett commented on that. "I don't know why we should be going back there to kill those poor furry devils," he told Crane and Burnham. "After all, they're fighting for their world."

"We wouldn't hurt them if they'd be reasonable and not attack us, would we?" Crane demanded. "We're only trying to make of Mars something besides a great useless desert."

"But the Martians seem to be satisfied with it as a desert," Halkett persisted. "What right have we, really, to change it or exploit its resources against their wishes?"

"Halk, if you talk like that people'll think you're pro-Martian," said Crane worriedly. "Don't you know that the Martians will never use those chemical and metal deposits until the end of time, and that earth needs them badly?"

"Not to speak of the fact that we'll give the Martians a better government than they ever had before," Burnham said. "They've always been fighting among themselves and the Council will stop that."

"I suppose that's so," Halkett admitted. "But just the same. I'm not keen on slaughtering any more of them with the atom-blasts as we did with Drake."

"There'll be nothing like that," Crane told him. "The Martians will see we're too strong and won't start anything."

Crane proved a poor prophet. For when the expedition, commanded by that Richard Weathering who had been Drake's second in command, reached Mars in its hundred rockets, trouble started. There was never a chance to try peaceful methods — fighting with the Martians began almost immediately.

It was evident that since Drake's expedition the Martians had anticipated further parties and had made some preparation. They had combined groups into several large forces and had devised some crude chemical weapons not unlike the ancient Greek fire. With these they rushed Weathering's rockets on the equatorial plateau where they had landed. But Weathering had already brought order out of the confusion of landing and was ready for them.

His first act on landing was to have his men bring the rockets together and throw up dirtworks around them. Both of these tasks were enormously simplified by the lesser gravitation of the planet. He had then set up batteries of atom-blasts at strategic locations behind his works, Jimmy Crane commanding one of these and Halkett another. These opened on the Martians as soon as they came into range. The furry masses, unable to use their rather ineffective chemical weapons, were forced to fall back with some thousands dead. They immediately tried to hem in the earthmen as they had done with the Drake expedition.

Weathering did not permit this. He knew that the Martians' source of existence was the gray vegetation of the oases. This vegetation was mostly a sage shrub which bore pod-like fruits about the time the polar snow-caps reappeared. Weathering sent parties forth,

Lieutenant Jimmy Crane heading one, to devastate the oases for a hundred miles around the earth-post.

They carried out orders though the Martians in those cases made fierce resistance, and there were mad combats of brown-clad earthmen and furry Martians in brilliant sunlight of day or black, freezing night. But Crane's and the other parties went stubbornly ahead, destroying the vegetation with atom-blasts. And in the end, with the vegetation that yielded their food-supply destroyed, the Martians in that hundred-mile circle had to retire across the red desert to other oases.

Weathering then split his forces into three divisions using his rockets to transport two of these divisions to points equidistant around Mars' equator. At each point a post like Weathering's own was established, with dirtworks in a square around it and atom-blast batteries mounted. Jimmy Crane, who had shown aptitude thus far in Martian campaigning, was made commander of one of these posts and a Lieutenant Lanson commander of the other. Halkett and Burnham stayed in Weathering's own post.

Eighty of the ninety-seven rockets that had landed safely. Weathering now sent back to earth for more men and supplies. Word came from earth that fifty new rockets had been constructed and were on their way with men and materials. Weathering distributed them equally among his three posts when they came and sent them also back to earth for more. Crane and Lanson, under his orders, had devastated the oases around their posts to drive the Martians back from them.

Chapter 2 The Conquest Of Mars

Weathering's men were becoming acclimated to Martian conditions. The oxygenation treatments eliminated most of the Martian fever, and as the earthmen's muscles attuned themselves gradually to the new gravitation their movements became more sure. It is worthy of note that some of those first venturers who went back from Mars to earth after a year on the red planet were stricken by a sort of earth-sickness due to earth's different conditions.

As reinforcements came in. Weathering continued to distribute them among the three posts of Crane and Lanson and himself. He wanted to establish the three forts firmly before an overwhelming Martian attack swept them out of existence. There were signs that that could be expected from the Martians.

The Martian attacks were growing fiercer. The Martians could see plainly enough the course Weathering was following, and that each week brought more rockets from earth with more men, more supplies and more atom-blasts and atomic bombs. They determined upon a concerted attack to wipe out the earthmen's three forts before they became too strong.

The attack broke against the three forts, so widely separated, at the same time. It did not catch Weathering and Crane and Lanson by surprise — their atom-blasts were ready. But even so, the Martian attack was almost irresistible in sheer weight. From far across the reddish desert surged the furry Martian masses toward the three little forts, coming on despite the atom-blasts that took toll of them by tens of thousands.

Weathering's post and that of Crane withstood the attack by only the utmost endeavor. Halkett had charge of one of the atom-blast batteries at Weathering's fort, on the side that the Martians attacked most determinedly. It was Halkett's battery that wrought the deadliest destruction amid the furry hordes.

The third post, that of Lanson, fell. The Martians got inside with their chemical weapons despite the atom-blasts and bombs of the earthmen. Lanson and his garrison were massacred to the last man by the Martians. Only one of the three rockets stationed at Lanson's post escaped, a little before the fort fell, and got to Weathering with the news.

Weathering acted at once, despite his own precarious situation. He assembled sixteen rockets from his fort and Crane's, loaded them with men and weapons, and sent them under the command of Mart Halkett to reestablish the third fort. They did so, taking the Martians there by surprise, and managed to hold the place in the face of the Martian attacks that followed.

There followed a lull in the fighting, with Weathering, Crane and Halkett holding grimly on in the three forts. The Martians had lost tremendous numbers without dislodging the earthmen, and were in no mood for further attacks in force. Yet they did not retire but continued to encircle the forts.

But steadily the earthmen's strength grew as more rockets came in. Earth was aflame over the situation, cheering Weathering as the upholder of terrestrial honor. The gallant fight of earth's lonely outposts there amid the Martian hordes had appealed to the popular imagination and there were insistent demands that the Interplanetary Council use all its powers to reinforce them.

It meant to do so. It sent Weathering a message stating as much, advancing him from colonel to general, promoting Jimmy Crane to colonel, and Halkett and Bumham and a number of others to captaincies. The enlistment bureaus of the Council on earth could not handle the flood of recruits.

Rockets were now pouring from the factories in a steadily increasing stream. Atomic weapons were also being produced in quantity and every few days saw rockets laden with supplies and men taking off for Mars. Many perished still in the dangers of the void but most arrived safely. Weathering continued to distribute the men and supplies they brought among his three posts.

When the three forts were strong enough to be impregnable to any Martian attack. Weathering began the establishment of new posts. He proceeded methodically to dot Mars with small but strong forts, each covering a certain portion of the planet's surface. Hall Bumham was made commander of one of the first of these. Crane and Halkett retaining command of their posts.

Within a year Weathering had a network of fifty forts stretched over Mars' surface from the north polar snow-cap to the southern one. He had in them strong garrisons of bronzed earthmen thoroughly acclimated to the Martian gravitation and atmosphere, and well seasoned in fighting with the stilt-limbed Martians. By then Halkett and Bumham were commanding two of the fifty forts, while Jimmy Crane was now Weathering's second in command. The two worked together distributing, according to their plan, among the fifty. posts, the streams of men and materials arriving from earth.

With the next melting of the polar snow-caps. Weathering was ready to begin the final subjugation of Mars. From a circle of six of his forts he sent out strong forces to attack and drive together the Martians in that circular territory. This was the plan evolved by Weathering and Crane, to concentrate forces upon one section of the planet at a time, using the forts around that section as bases, mopping up the Martians in that section thoroughly and then proceeding to another.

Crane had charge of the first operation and it worked perfectly. The Interplanetary Council had directed Weathering to offer the Martians peace if they promised to obey the Government's authority. But Crane's men had no chance even to make the offer, so utterly fierce was the Martian resistance.

The Martians had never expected what happened. The furry, stilt-limbed men had ceased their attacks on the earthmen's forts some time before, save for occasional raids, and had retired to take up existence in the vegetation oases remoter from the forts. There they had lived as they had for ages, moving in nomadic fashion through the oases gathering the fruits upon which they subsisted, digging as ages of experience had made them skillful in doing for the underground springs. Now the earthmen were attacking them! The Martians rose madly to the fight.

But Crane's forces were strongly armed and with atom-blasts and atom bombs against their crude weapons the Martians had no chance. Those in that section were mostly killed in the fighting and the few remaining were herded into prison camps. Crane went on under Weathering's order to another section and repeated the maneuver. Halkett's fort was one of the posts around that section, but Halkett and Crane had small opportunity of seeing each other in the midst of the grim business of rounding up the Martians. With that section subdued like the first, the forces of Crane concentrated on another.

Within another year Weathering could send word back to the Council that the plan had succeeded and that except for a few remote wastes near the snow-caps, Mars was entirely subjugated. In that year approximately three-fourths of the Martian race had perished, for in almost every case their forces had resisted to the last. Those who remained could constitute no danger to the earthmen's system of forts. The Council flashed Weathering congratulations and gave Crane command of the expedition then fitting out on earth for the exploration of Jupiter.

Crane went back to earth to take charge of it, first taking warm leave of Mart Halkett and Hall Bumham at the posts they commanded. Crane spent a half year on earth preparing his expedition of two hundred rockets to meet conditions on Jupiter. For Jupiter presented a greater problem to earth explorers than had Mars, and biologists and chemists had been working to overcome the obstacles.

The greatest difficulty, Crane saw, was Jupiter's gravitation, almost twice that of earth despite the swift-spinning planet's counteracting centrifugal force. Gillen's visit to Jupiter on his epochal flight had been terminated by sickness brought on by that greater gravitation and the heavy damp atmosphere. Crane's men must be strengthened to withstand these influences.

Earth's scientists solved the problem to some extent by devising rigid metallic clothing not unlike armor which would support the interior human structure against Jupiter's pull. Crane's men were also administered compounds devised by the biochemists for the rapid building of bone to strengthen the skeleton structure, while respirators which absorbed a percentage of the water vapor in air would solve for Crane's men the problem of the heavy wet atmosphere.

So equipped. Crane's expedition sailed in its two hundred rockets for Jupiter, choosing a time when the asteroid zone between earth and Jupiter was comparatively clear. Even so, sixteen of the two hundred rockets never reached their destination. The others landed safely in the fern forests of the southern half of Jupiter, and Crane began there establishment of the first earth-post.

He found himself with troubles enough. For though the metal armor and other protections safeguarded the earthmen fairly effectively from the greater gravitation, they found it still difficult to make the simplest motions. It took weeks for Crane's men, against the drag of the Jovian gravity, to clear the fern forest around them and turn up dirtworks of the oozy black Jovian soil.

Sickness was rife among them, for the respirators did not work as well as the safeguards against gravitation. The heavy wet air worked havoc with the earthmen's lungs and the so-called Jovian croup became soon as well-known and much more feared than Martian fever. Men toiling in the thin sunlight were stricken by it. Crane's forces were decimated by it. The fern forests, too, held weird forms of life that proved a problem, some of them disk-shaped things of flesh that enveloped anything living in their bodies and ingested it directly. There were also strange huge worm-like things existing in the oozy soil, and others stranger still. Crane's men had to work with atom- blasts constantly ready to repel these strange predatory forms of life.

Out of the fern forests, too, came to watch the earthmen hosts of the big, soft-bodied creatures Gillen had called the Jovians. These had bodies eight feet high and six feet around, like big cylinders of hairless brown flesh supported on thick flipper-like limbs, with similar flipper-like arms. Their small round heads had dark mild eyes and mouths from which came their deep bass speech. Crane found they were perhaps as intelligent as the Martians but were rather more peaceful, their only weapons spears with which they fought off the things in the fern forests that attacked them.

They were quite friendly toward the earthmen and watched their operations with child-like interest. Crane intended to avoid Drake's mistake and not clash with the Jovians in any way while his men toiled to establish first one post and then others over southern Jupiter. He reported to the Council that he would only operate in South Jupiter for the time being. And while earth followed Crane's work on South Jupiter with intense interest, a host of changes were occurring on Mars.

Mart Halkett, still commanding his equatorial Martian post, saw a new kind of migration now going on from earth to Mars. Hitherto the rockets had carried hardly anything but the reinforcements of the Council and their supplies. But now Halkett saw crowds of civilians pouring into the newly subjugated planet. They were magnates, speculators, engineers, mechanics, for the Council was now granting concessions in the great Martian mineral and chemical deposits.

Halkett saw those forts nearest the deposits, including his own, grow rapidly into raw mine towns packed with earthmen of all kinds. Martian fever had been completely conquered by earth's scientists and some of these crude new towns contained thousands of earthmen. There could be seen among them occasional stilt-limbed, huge- chested Martians moving about as though bewildered by the activity about them, but most of the remaining Martians were on certain oases set aside for them as reservations. Refining and extracting plants were set up as mining operations grew, and Halkett saw the rocket fleets that arrived with men and machinery going back to earth laden with metals and chemicals.

Halkett went up to Burnham's post in northern Mars sick at heart. He told Burnham he had secured a transfer to Jupiter to serve there in Jimmy Crane's expanding system of forts.

"I can't stand this any longer. Burn," he said. "I mean what we've done to this world — the Martians, its people, almost wiped out and those left treated the way they are."

Burnham looked keenly at him. "You're taking it too hard, Halkett," he said. "It's been a tough time, I admit, but that's all over now the Martians are conquered."

"Conquered — wiped out, I say again," Halkett said bitterly. "Burnham, I dream about it sometimes — those waves of furry stilt-men coming on and on toward certain death, and my atom-blasts mowing them down like grass."

"They had to be conquered," Bumham argued. "Isn't it worth it? Look at all this planet's resources thrown open to real use now instead of lying unused."

"Thrown open to a lot of speculators and financiers to extract a profit from," Halkett amended. "The Martians are killed off and we do the dirty work of killing them and all for what? So this bunch swarming into Mars now can enrich themselves."

"That's too narrow a view," Bumham told him. "It's inevitable that there'll be certain evils in the course of an expansion like this."

"Why expand, then?" asked Halkett. "Why not stay on our own planet and leave these poor devils of Martians and Jovians keep theirs?"

Bumham shook his head. "Expansion is as inevitable as a full tank overflowing into an empty one. Anyway, Halk, the fighting's over here now so why go on to Jupiter?"

"Because I feel like a murderer haunting the scene of his crime," Halkett told him. "When I see some of these degraded Martians hanging around our towns, begging for food and getting cuffed and kicked out of the way by earthmen, I want to get out of here to I don't care where."

Halkett went on to Jupiter. He found by then Crane had established a dozen posts over the southern half of the vast planet, following Weathering's Martian system. Jovian croup was giving Crane more trouble than anything else and the dreaded disease was often fatal, the death list sometimes appalling while the earth scientists worked frantically to control the disease. They finally succeeded in evolving a serum which was an effective preventive. Halkett was inoculated with this immediately on reaching Jupiter.

Halkett found that Crane was, despite the difficulties, strengthening his system of posts as reinforcements arrived constantly from I earth. He had been successful in avoiding trouble with the Jovians so far — the strange forms of life that came out from the steamy fern forests to attack the earthmen were of more concern than the numberless but peaceful hosts of the Jovians

Crane commented on the Jovians to Halkett the night after the latter's arrival. The two had been outside the post and Halkett had met the Jovians for the first time, the big, soft-eyed flipper-men clustering around him like interested children. Now he and Crane sat in Crane's lamp-lit office, whose windows looked out across the post to the mighty wall of the surrounding fern forest. Halkett could hear the calls and screams of the forest's various weird tenants, and could see its steamy mists rising into the light of the two moons then in the sky, Callisto and Europa.

"These Jovians aren't a bad bunch, Halk," Colonel Jimmy Crane told his friend. "They seem too mild to give us any real trouble, though God knows how many millions of them there are."

He was enthusiastic about Jupiter's possibilities. "I tell you, this is the planet of the future. Stick a seed in the ground and in a week you've a tree — this planet will be supporting trillions of humans some day when earth and Mars are overcrowded."

"Where will the Jovians be when that day arrives?" Halkett asked him. Crane looked at him.

"Still holding to that viewpoint? Halkett, we have to let some things take care of themselves. Be sure we'll not harm the Jovians if they don't try banning us."

"Well, we may be able to get along with them," Halkett said thoughtfully. "They seem rather more peaceful than the Martians."