sheer necessity for silence. He fought against it, but no words came.

It was evening: the rolling hills about them were already dark; only the heads of the mountains took the day; and now they paused at the top of a rise and the girl pointed across the hollow. "There we are," she said. It was a tall clump of trees through which broke the outlines of a two-storied house larger than any the doctor had seen in the mountain-desert; and outside the trees lay long sheds, a great barn, and a wide-spread wilderness of corrals. It struck the doctor with its apparently limitless capacity for housing man and beast. Coming in contrast with the rock-strewn desolation of the plains, this was a great establishment; the doctor had ridden out with a waif of the desert and she had turned into a princess at a stroke. Then, for the first time since they left Elkhead, he remembered with a start that he was to care for a sick man in that house.

"You were to tell me," he said, "something about the sickness of your father—the background behind his condition. But we've both forgotten about it."

"I have been thinking how I could describe it, every moment of the ride," she answered. Then, as the gloom fell more thickly around them every moment, she swerved her horse over to the mare, as if it were necessary that she read the face of the doctor while she spoke.

"Six months ago," she said, "my father was robust and active in spite of his age. He was cheerful, busy, and optimistic. But he fell into a decline. It has not been a sudden sapping of his strength. If it were that I should not worry so much; I'd attribute it to disease. But every day something of vitality goes from him. He is fading almost from hour to hour, as slowly as the hour hand of a clock. You can't notice the change, but every twelve hours the hand makes a complete revolution. It's as if his blood were evaporating and nothing we can do will supply him with fresh strength."

"Is this attended by irritability?"

"He is perfectly calm and seems to have no care for what becomes of him."

"Has he lost interest in the things which formerly attracted and occupied him?"

"Yes, he minds nothing now. He has no care for the condition of the cattle, or for profit or loss in the sales. He has simply stepped out of every employment."

"Ah, a gradual diminution of the faculties of attention."

"In a way, yes. But also he is more alive than he has ever been. He seems to hear with uncanny distinctness, for instance."

The doctor frowned.

"I was inclined to attribute his decline to the operation of old age," he remarked, "but this is unusual. This—er—inner acuteness is accompanied by no particular interest in any one thing?".

As she did not reply for the moment he was about to accept the silence for acquiescence, but then through the dimness he was arrested by the lustre of her eyes, fixed, apparently, far beyond him.

"One thing," she said at length. "Yes, there is one thing in which he retains an interest."

The doctor nodded brightly.

"Good!" he said. "And that—?"

The silence fell again, but this time he was more roused and he fixed his eyes keenly upon her through the gloom. She was deeply troubled; one hand gripped the horn of her saddle strongly; her lips had parted; she was like one who endures inescapable pain. He could not tell whether it was the slight breeze which disturbed her blouse or the rapid panting of her breath.

"Of that," she said, "it is hard to speak—it is useless to speak!"

"Surely not!" protested the doctor. "The cause, my dear madame, though perhaps apparently remote from the immediate issue, is of the utmost significance in diagnosis."

She broke in rapidly: "This is all I can tell you: he is waiting for something which will never come. He has missed something from his life which will never come back into it. Then why should we discuss what it is that he has missed."

"To the critical mind," replied the doctor calmly, and he automatically adjusted his glasses closer to his eyes, "nothing is without significance."

"It is nearly dark!" she exclaimed hurriedly. "Let us ride on."

"First," he suggested, "I must tell you that before I left Elkhead I heard a hint of some remarkable story concerning a man and a horse and a dog. Is there anything—"

But it seemed that she did not hear. He heard a sharp, low exclamation which might have been addressed to her horse, and the next instant she was galloping swiftly down the slope. The doctor followed as fast as he could, jouncing in the saddle until he was quite out of breath.

CHAPTER IV

THE CHAIN

They had hardly passed the front door of the house when they were met by a tall man with dark hair and dark, deep-set eyes. He was tanned to the bronze of an Indian, and he might have been termed handsome had not his features been so deeply cut and roughly finished. His black hair was quite long, and as the wind from the opened door stirred it, there was a touch of wildness about the fellow that made the heart of Randall Byrne jump. When this man saw the girl his face lighted, briefly; when his glance fell on Byrne the light went out.

"Couldn't get the doc, Kate?" he asked.

"Not Doctor Hardin," she answered, "and I've brought Doctor Byrne instead."

The tall man allowed his gaze to drift leisurely from head to foot of
Randall Byrne.

Then: "H'ware you, doc?" he said, and extended a big hand. It occurred to Byrne that all these men of the mountain-desert were big; there was something intensely irritating about their mere physical size; they threw him continually on the defensive and he found himself making apologies to himself and summing up personal merits. In this case there was more direct reason for his anger. It was patent that the man did not weight the strange doctor against any serious thoughts.

"And this," she was saying, "is Mr. Daniels. Buck, is there any change?"

"Nothin' much," answered Buck Daniels. "Come along towards evening and he said he was feeling kind of cold. So I wrapped him up in a rug. Then he sat some as usual, one hand inside of the other, looking steady at nothing. But a while ago he began getting sort of nervous."

"What did he do?"

"Nothing. I just felt he was getting excited. The way you know when your hoss is going to shy."

"Do you want to go to your room first, doctor, or will you go in to see him now?"

"Now," decided the doctor, and followed her down the hall and through a door.

The room reminded the doctor more of a New England interior than of the mountain-desert. There was a round rag rug on the floor with every imaginable colour woven into its texture, but blended with a rude design, reds towards the centre and blue-greys towards the edges. There were chairs upholstered in green which looked mouse-coloured where the high lights struck along the backs and the arms—shallow-seated chairs that made one's knees project foolishly high and far. Byrne saw a cabinet at one end of the room, filled with sea-shells and knicknacks, and above it was a memorial cross surrounded by a wreath inside a glass case. Most of the wall space thronged with engravings whose subjects ranged from Niagara Falls to Lady Hamilton. One entire end of the room was occupied by a painting of a neck and neck finish in a race, and the artist had conceived the blooded racers as creatures with tremendous round