There were plough-lands across on this side of the Santiago River also, and the trail led through a part of these. Where it crossed the ditch that supplied them with water he found the ground wet on the farther bank, and fresh hoof-prints of a horse in the soft earth. Someone had crossed there on horseback not more than fifteen or twenty minutes before; yes, and there, close alongside, was the sharp-toed, inward-curved print of an Indian moccasin. Stephens and Felipe were both ahead of him.

It was only in a place like this, where the soft earth retained a deep impression, that he could pretend to recognise their tracks by the light of the moon, but the fact that he had judged so accurately the course they were steering gave him confidence as he pressed forward, still following the line. And now the foot of the sierra was reached, and the trail plunged abruptly into broken and rugged defiles. Onward he pushed without halting, encouraged again and again by detecting at intervals the tracks of the horse going ahead. At last, however, there came a long interval, when he no longer saw the tracks. For a while he tried to persuade himself that it was only a chance that had caused him to fail to notice them, but he came finally to where the trail crossed a little creek, and the ground was soft and the trees were open enough to let the moonlight fall clearly on the spot. The sign of the Indian horses that had crossed it coming to San Remo during the afternoon was evident, but the footprints of the horse he was following in the other direction were not there. It was undeniable that he must have quitted the trail.

"Now, whereabouts did the son of a gun leave it?" asked Backus of himself; "and how far back was it that I got a squint of his track last?" He pulled out a cold lunch, that he had brought along in his pocket, put on his overcoat, and sat down to take a rest and think things over. If Stephens had simply turned off and camped near the trail, he might have missed him by very little. Perhaps Felipe had been able to keep him in sight, and had stuck to him.

He started to take the back track, keeping a sharp watch out for likely places for a rider to turn out on one side or other of the trail. There were plenty of them, but he found no sign in any of those that he examined. And he had the exasperating sense, that trying to hit off a lost trail by moonlight was as futile a job as a man ever undertook. By daylight a master of woodcraft may assure himself that he has not walked over a hoofprint for which he is searching without seeing it, but the best trailer that ever stepped can miss a thing by moonlight that by day would be as plain to him as a printed book.

"A fool's errand," he said to himself, "that's what I'm on. Here I might be comfortably at home and snug in bed, and instead of that I'm lost up here in the sierra away along after midnight, and nary chance of finding what I come out after." He was thoroughly out of temper by this time, and his language was according. "Mine! d—n the mine! I believe the whole thing is a holy fraud, and if anyone ever again catches me out in the dark, on top of a rugged range of hills hunting for a mine that never existed, I'll give him leave to cut me into slices and fry me like so much bacon." He sat down to rest a moment before deciding finally whether to make any further effort, or just chuck and make the best of his way home.

At this moment, faint but distinct, came the sound of a shot fired somewhere in the mountain off to the south. Backus sprang to his feet instantly, shaking himself free from his despondency like a cloak.

"By the jumping Jemini!" he ejaculated, "there they are, I'll wager. Felipe must have managed to stick to the trail. Good for him! I wonder if he's managed to plug him? I'll just take a scout round that way and see if I can spot anything."

The moon was beginning to sink in the west, but there was light enough for him to pick his way through the trees and rocks in the direction of the shot. Suddenly he heard five shots in quick succession. They were nearer and clearer than before. But they were followed by absolute silence. Again and again he paused to listen, but no sounds greeted his ear save those that belonged to the woods at night, till at last, after scrambling up a rocky ridge, he became aware of a reflected light shining at the foot of a cliff. That meant a camp-fire. Hist! was that somebody talking? If Felipe had killed his man properly, there was no one for him to talk to. He advanced a step or two cautiously, and paused again. He fancied he could hear a voice; he would put his ear to the ground and see if he could not hear better so; he stooped, and sank on all fours as if he was after a deer, bending his head towards the earth, and as he did so he received a hard blow on his face, and a smart pang shot through his cheek, and at the same moment his ears were assailed by an angry, buzzing rattle.

"My God!" he cried, "I'm stung by a snake!" He threw up his hand to his wounded cheek and staggered to his feet, while the snake, having delivered his blow, slithered away to his home in the rocks. The agony of the poison began to dart through his veins. He struggled blindly forward towards the light, which now seemed ever so far away; he stopped and drew out his knife, with the idea of cutting out the venom, but it was right in his cheek; had it been in a finger he might have chopped it off, but he could not slash away half his own face. He flung the knife wildly from him and reeled forward again, knocking against the trees as he went like a blinded wolf. He had been struck by a big rattler with a full dose of venom in him after his winter's rest. His knees grew weak, and tottered under him; he fell, and struggled up again, only to fall once more; fearful pains ran through him, and his body seemed too big for his skin.

"Help," he cried, in a spent and broken voice; "help me! oh, help!" and he pitched forward and lay prone on his face, writhing and digging his nails into the ground.