Donaldson toiled up the dark staircase leading to Barstow\'s laboratory. To him it was as though he were fighting his way through deep water reaching twenty fathoms above his head. The air was just as cold as green water; it contained scarcely more life. He felt the same sense of clammy, lurking things, unknown things, such as crawl along the slimy bottoms where rotting hulks lie. He was impelled here by the same sort of fascination which is said to lead murderers back to their victims, yet it seemed to be the only place where he would be able to think at all. It was getting back to the beginning—to the source—where he could start fresh. It was here, and here alone, that he could write his letter to her. Perhaps here he could make something out of the chaos of his thoughts.

When he reached the top of the stairs, he paused before the closed door. He did not expect Barstow to be in. He hoped that he was not. He did not wish to face him to-day. To-morrow perhaps—but he realized that if Barstow had gone on his proposed vacation he would not be back even then. That did not matter either. The single thing remaining for him to do was to make Elaine understand something of what his life had meant, what she had meant in it, what he hoped to mean to her in the silent future. That must be done alone, and this of all places was where he could best do it. The mere thought of his room at the hotel was repulsive to him.

He listened at the door. There was no sound—no sound save the interminable "tick-tock, tick-tock" which still haunted him through the pulse beats in his wrists. He reached forward and touched the knob; listened again, and then turned it and pressed. The door was locked. But it was a feeble affair. Barstow had made his experimental laboratory in this old building to get away from the inquisitive, and half of the time did not take the trouble to turn the key when he left, for there was little of value here.

He knocked on the chance that Barstow might have lain down upon the sofa for a nap. Again he waited until he heard the "tick-tock, tick-tock" at his wrists. Then, pressing his body close to the lock, he turned the knob and pushed steadily. It weakened. He drew back a little and threw his weight more heavily against it. The lock gave and the door swung open.

The sight of the threadbare sofa was as reassuring as the face of an old friend. Yet what an eternity it seemed since he had sat there and discussed his barren life with Barstow. The phrases he had used came back to mock him. He had talked of the things that lay beyond his reach, while even then they were at his hand, had he been but hardy enough to seize them; he had spoken of what money could buy for him, with love eagerly pressing greater gifts upon him without price; he had hungered for freedom with freedom his for the taking. Sailors have died of thirst at the broad mouth of the Amazon, thinking it to be the open salt sea; so he was dying in the midst of clean, sweet life.

He sat down on the sofa, with his head between his hands and stared at the glittering rows of bottles which caught the sun. Each one of them was a laughing demon. They danced and winked their eyes—yellow, blue, and blood-red. There were a hundred of them keeping step to the bobbing shadows upon the floor. Row upon row of them—purple, brown, and blood-red—all dancing, all laughing.

"You come out wrong every time," Barstow had said.

And he—he had laughed back even as the bottles were doing.

He was not cringing even now. He was asking no pity, no mercy. When he had stepped across the room and had taken down that bottle, he had been clear-headed; he had been clear-headed when he had swallowed its contents. The only relief he craved for himself was to be allowed to remain clear-headed until he should have written his letter. Coming up the stairs he feared lest this might not be. Now he seemed to be steadying once more.

He thought of Sandy. Poor pup, he had gone out easily enough. He had curled up on a friendly knee and gone to sleep. That was all there had been to it. It would be an odd thing, he mused, if the dog was where he could look down on this man-struggle. This braced him up; he would not have even this dog see him die other than bravely.

As far as he himself was concerned, he knew that he would go unflinchingly to meet his final creditor, but there were the Others—with Sandy there had been no Others. It was easy enough to die alone, but when in addition to one\'s own death throes one had to bear those of others,—that was harder. When he died, it would be as when several died. There would be that mother in Vermont—part of her would die with him; there would be Saul—even part of him would die with him; there was Ben—some of him would die, too; and there was Elaine—good God, how much of her would die with him?

He sprang to his feet and began to pace the stained wooden floor. As he did so, a shadow crawled, from beneath the sofa and stole across the room like a rat. But unlike a rat, it did not disappear into a hole; it came back again towards Donaldson. He stopped. Close to the ground the shadow crept nearer until he saw that it was a dog. Then he saw that it was a black terrier. Then he saw that in size, color, and general appearance it was the living double of Sandy.

He stooped and extended his hand. He tried to pronounce the name, but his lips were too dry. The dog crouched, frightened, some three feet distant. Donaldson, squatting there, watched him with straining eyes. Once again he tried to utter the name. It stuck in his throat, but at the inarticulate cry he made, the dog wagged his tail so feebly that it scarcely moved its shadow. Donaldson ventured nearer. The dog rolled over to its back and held up its trembling forefeet on guard, studying Donaldson through half closed eyes with its head turned sideways.

Donaldson put forward his trembling fingers and touched its side. The dog was warm, even as Sandy had been when he first picked him up. The dog feebly waved his padded paws and finally rested them upon Donaldson\'s hand.

"Sandy! Sandy!" he murmured, his voice scarcely above a whisper.

The dumb mouth moved nearer to lick the man\'s fingers, but his movements were negative as far as any recognition of the name went. It was just the friendly overture of any dog to any man.

If he could get him to answer to the name! It meant life—a chance for life! It meant, perhaps, that there had been some mistake—that, perhaps, after all, the poison was not so deadly as Barstow had thought it.

He threw himself upon the floor beside the dog. In the body of this black terrier centred everything in life that a man holds most dear. If he could speak—if the dumb tongue could wag an answer to that one question!

The dog turned over and crawled nearer. Donaldson fixed his burning eyes upon the blinking brute.

"Sandy," he cried, "is this you, Sandy?"

The moist tongue reached for his fingers.

He took a deep breath. He said,

"Dick—is this you, Dick?"

Again the moist tongue reached for his fingers.

Donaldson picked him up.

"Sandy," he cried, "answer me."

The dog closed his eyes as though expecting a blow.

Donaldson dropped him. The animal crawled away beneath the sofa. Donaldson felt more alone that minute than he had ever felt in all his life. It was as though he sat there, the sole living thing in the broad universe. There was nothing left but the blinking eyes of the bottles dancing in still brisker joy. He could not endure it.

Moving across the room he knelt by the sofa and tried to coax the frightened animal out again.

"Sandy. Come, Sandy," he called.

There was no show of life. He snapped his fingers. He groped beneath the old lounge. Then, in a frenzy of fear, lest it had all been an apparition, he swung the sofa into the middle of the room. The dog followed beneath it, but he caught a glimpse of him. He pushed the sofa back to the wall and began to coax again.

"Come out, Sandy. I \'ll not hurt you. Come, Sandy."

There was a scratching movement and the............