There, within the first hour, he heard a report that his man had gone on to Rio Janeiro, caught the cholera, and died there. Undaunted by the epidemic, Frawley took the next boat and entered the stricken city by swimming ashore. For a week he searched the hospitals and the cemeteries. Greenfield had indeed been stricken, but, escaping with his life, had left for the northern part of Brazil. The delay resulted in a gain of three months for Frawley, but without heat or excitement he began anew the pursuit, passing up the coast to Para and the mouth of the Amazon, by Bogota and Panama into Mexico, on up toward the border of Texas. The months between him and Greenfield shortened to weeks, then to days without troubling his equanimity. At El Paso he arrived a few hours after Greenfield had left, going toward the Salt Basin and the Guadalupe Mountains. Frawley took horses and a guide and followed to the edge of the desert. At three o'clock in the afternoon a horseman grew out of the horizon, a figure that remained stationary and attentive, studying his approach through a spy-glass. Suddenly, as though satisfied, the stranger took off his hat and waved it above his head in challenge, and digging his heels into his horse, disappeared into the desert.
VI
Frawley understood the challenge—the end was to be in the desert. Failing to move his guide by threat or promise, he left him clamoring frantically on the edge of the desert and rode on toward where the figure of Greenfield had disappeared on the horizon in a puff of dust.
For three days they went their way grimly into the parched sands, husbanding every particle of strength, within plain sight of each other, always at the same unvarying walk. At night they slept by fits and starts, with an ear trained for the slightest hostile sound. Then they cast aside their saddles, their rifles, and superfluous clothing, in a vain effort to save their mounts.
The horses, heaving and staggering, crawled over the yielding sands like silhouettes drawn by a thread. In the sky not a cloud appeared; below, the yellow monotony extended as flat as a dish. Above them a lazy buzzard, wheeling in languid circles, followed with patient conviction.
On the fourth morning Frawley's horse stopped, shuddered, and went down in a heap. Greenfield halted and surveyed his discomfiture grimly, without a sign of elation.
"That's bad, very bad," Frawley said judicially. "I ought to have sent word to the department. Still, it's not over yet—his horse won't last long. Well, I mustn't carry much."
He abandoned his revolver, a knife, $200 in gold, and continued on foot, preserving only the water-bag with its precious mouthful. Greenfield, who had waited immovably, allowed him to approach within a quarter of a mile before putting his horse in motion.