Between two plants not three feet apart two rattlesnakes were engaged in mortal combat. They coiled with incredible rapidity, flew at each other with burning eyes and darting tongues, burying a fang somewhere in the tense bristling armours. The lashing tails struck the spiked surface of the cactus and augmented their fury; occasionally they whipped about, hissing deliriously, then returning as swiftly to the only enemy in sight. They had coiled and struck some four or five times, whipping all over their narrow arena, when as if by common consent, they retreated to extreme opposite points, coiled as lightning strikes, and leapt at each other. Even Roldan gave a hoarse cry of surprise, and as for Adan, he fell into vocabulary: one serpent had darted straight down the throat of the other. For a moment there was a fearful lashing. The choking serpent, with protruding eyes, like small green coals, and jaws distended in agony, strove to dislodge his suffocating enemy, and the other humped his back and leapt backward in frantic efforts to reach the air again. But suddenly their struggles ceased; they flattened to the ground, only the tails moving automatically. What was left looked like a monster of some unknown species; a creature with no head, a huge belly, and two tails. "Caramba!" exclaimed Adan, "I could not eat that even if we had anything to cook it with. It looks like a mass of poison." "I should like to know where that poison was last night. It may be a good sign, however: as they are the first living things we have seen, we may be near to the edge of the desert." Adan crossed himself. "Come," continued Roldan, "let us move on, before hunger tempts us too far." Once more they started on their tortuous way. They walked very slowly, both from necessity and inclination: the excitement of the fight over, their physical necessities pressed heavily; they kept as close together as they could, but rarely spoke: they were too hungry. Both were oppressed by the fear that at any minute they would come upon a solid wall of cacti and be obliged to retrace their steps, and both knew that might mean a stunning blow to courage. At times the constant zig-zagging, the unalterable, smooth, grey-green surface of the cacti, made them halt dizzily, for both brain and body were sick for want of food. But by degrees the wood grew thinner and thinner; and when the sun was half way between the zenith and the western horizon, they left behind the last straggling outpost and found themselves on the edge of a creek, the same doubtless that they had crossed three nights before. They gave each other a feeble simultaneous slap on the back, gathered their energies, ran down the bank, and took a long draught of the running water. "I feel better," said Roldan, finally, "but hungrier than ever. There are quail in that chaparral over there. I'll go after them, and do you hunt for flint and build a fire."