and devitalizing forces which even the heat could not dissipate. In that noonday light which burned and burned and made no impression on the moisture, Swan's face was wilted like a white flower which is dead and turning yellow. His eyes, too, were like things once living and now dead. The muscles around his mouth twitched like electric wire.
"It isn't possible for me to finish it alone," he told himself. He knew that he could finish the job by working both night and day, but could he stand the strain? Had he, after all, a stronger physique than any other white man had ever had before? He leaned far back as if he were trying to fold himself up, and then bent forward in the same manner, trying, with a desperation like death, to relieve the weakness that was numbing his limbs. He suddenly felt dizzy as he looked at the hot distance where some big leaves were waving—dizzy as he knew that he must fail.
"By God!" he exclaimed, striking the pile of dirt. "By God! I'll do it!"
Pilchard put on his hat and smiled. He had been waiting for this. "If you say you will, I bet you will!" he told Swan. "That's why you'll always come out ahead." As he said this he looked intently at Swan, who was still sitting on the pile of dirt. He noticed for the first time the peculiar look in his eyes and the trembling of his whole body.
Swan sat silent. He saw the dark perspiring bodies of the Indians who were laying ties, and his lifelong ambition to be a great engineer suddenly presented itself to him in the old strong unemotional way.
"For science is a cruel mistress. She exacts her yearly tribute of flesh and blood like the dragons of ancient pagan mythology."
This had been said by an eminent scientist who had addressed his graduating class. Swan had heard it then and remembered it now. He clearly remembered that hot June morning ten years ago. Some young maple leaves had made a lovely pattern on the blue northern sky outside the uncurtained windows of the lecture-hall. He remembered that he had looked through the window and vowed that he would never give up.
He organized two bands of men, one to work by moonlight and one by sunlight; but it was necessary for him to overlook them both, day and night, so it happened that there were just two hours in the twenty-four when he could find any rest. This was when the daily tropical storm broke, late in the afternoon, and all the workmen scampered for shelter. Swan crawled into a shanty the men had put up to hold their tools, and wrapping himself in a blanket, slept until the storm was over. That is to say, for three or four times he slept, but gradually he found it impossible to get any rest, and nobody knew the agonies he endured fighting off the fever, which he felt had marked him for its own. He never looked forward longer than twelve hours, thinking always that the next day would decide his fate, and the next day never did. "If I can keep it off till to-morrow, I guess it won't come back," he repeated, mechanically, standing in the moonlight and dosing himself and bossing the men. But in the morning there was never any abatement in those deadly symptoms which told him that the period of incubation would soon be over; and it almost seemed to him as if his cruel mistress was saving him in some miraculous way to complete her work, for it was not until the evening of the ninth day, when the railroad was finished and the last man paid off, that his temperature rose to fever-heat, his pulse quickened, and his tongue became congested, and this demon of the tropical swamp claimed him for its own.
Early on the morning of the 25th, a Pacific mail-steamer touched at the little port of Zacatula, and a man was put off who came down from San Francisco to do business for the company in the event of the railroad not being completed. He was greatly astonished when Pilchard showed him that the last day's work had been done.
"Then," said the agent, mopping his perspiring bald head, "we may say that you've carried out the contract to the letter, to the very minute. You say you only paid off the men last night?"
"Yes," answered Pilchard, with his engaging smile, and casting a possessive glance down the front of his white trousers. "And it was an awful rush to get the job done." But in spite of Pil-
