The sweet, pale Ajo lily gleamed in shady corners.

Ten miles of travel covered the length of the pa.s.s. It opened wide upon a wonderful scene, an arboreal desert, dominated by its pure light green, yet lined by many merging colors. And it rose slowly to a low dim and dark-red zone of lava, spurred, peaked, domed by volcano cones, a wild and ragged region, illimitable as the horizon.

The Yaqui, if not at fault, was yet uncertain. His falcon eyes searched and roved, and became fixed at length at the southwest, and toward this he turned his horse. The great, fluted saguaros, fifty, sixty feet high, raised columnal forms, and their branching limbs and curving lines added a grace to the desert. It was the low-bushed cactus that made the toil and pain of travel. Yet these th.o.r.n.y forms were beautiful.

In the basins between the ridges, to right and left along the floor of low plains the mirage glistened, wavered, faded, vanished--lakes and trees and clouds. Inverted mountains hung suspended in the lilac air and faint tracery of white-walled cities.

At noon Yaqui halted the cavalcade. He had selected a field of bisnagi cactus for the place of rest. Presently his reason became obvious.

With long, heavy knife he cut off the tops of these barrel-shaped plants. He scooped out soft pulp, and with stone and hand then began to pound the deeper pulp into a juicy ma.s.s. When he threw this out there was a little water left, sweet, cool water which man and horse shared eagerly. Thus he made even the desert's fiercest growths minister to their needs.

But he did not halt long. Miles of gray-green spiked walls lay between him and that line of ragged, red lava which manifestly he must reach before dark. The travel became faster, straighter. And the glistening thorns clutched and clung to leather and cloth and flesh. The horses reared, snorted, balked, leaped--but they were sent on. Only Blanco Sol, the patient, the plodding, the indomitable, needed no goad or spur. Waves and scarfs and wreaths of heat smoked up from the sand.

Mercedes reeled in her saddle. Thorne bade her drink, bathed her face, supported her, and then gave way to Ladd, who took the girl with him on Torre's broad back. Yaqui's unflagging purpose and iron arm were bitter and hateful to the proud and haughty spirit of Blanco Diablo.

For once Belding's great white devil had met his master. He fought rider, bit, bridle, cactus, sand--and yet he went on and on, zigzagging, turning, winding, crashing through the barbed growths. The middle of the afternoon saw Thorne reeling in his saddle, and then, wherever possible, Gale's powerful arm lent him strength to hold his seat.

The giant cactus came to be only so in name. These saguaros were thinning out, growing stunted, and most of them were single columns.

Gradually other cactus forms showed a harder struggle for existence, and the s.p.a.ces of sand between were wider. But now the dreaded, glistening choya began to show pale and gray and white upon the rising slope. Round-topped hills, sunset-colored above, blue-black below, intervened to hide the distant spurs and peaks. Mile and mile long tongues of red lava streamed out between the hills and wound down to stop abruptly upon the slope.

The fugitives were entering a desolate, burned-out world. It rose above them in limitless, gradual ascent and spread wide to east and west. Then the waste of sand began to yield to cinders. The horses sank to their fetlocks as they toiled on. A fine, choking dust blew back from the leaders, and men coughed and horses snorted. The huge, round hills rose smooth, symmetrical, colored as if the setting sun was shining on bare, blue-black surfaces. But the sun was now behind the hills. In between ran the streams of lava. The hors.e.m.e.n skirted the edge between slope of hill and perpendicular ragged wall. This red lava seemed to have flowed and hardened there only yesterday. It was broken sharp, dull rust color, full of cracks and caves and crevices, and everywhere upon its jagged surface grew the white-thorned choya.

Again twilight encompa.s.sed the travelers. But there was still light enough for Gale to see the constricted pa.s.sage open into a wide, deep s.p.a.ce where the dull color was relieved by the gray of gnarled and dwarfed mesquite. Blanco Sol, keenest of scent, whistled his welcome herald of water. The other horses answered, quickened their gait.

Gale smelled it, too, sweet, cool, damp on the dry air.

Yaqui turned the corner of a pocket in the lava wall. The file of white horses rounded the corner after him. And Gale, coming last, saw the pale, glancing gleam of a pool of water beautiful in the twilight.

Next day the Yaqui's relentless driving demand on the horses was no longer in evidence. He lost no time, but he did not hasten. His course wound between low cinder dunes which limited their view of the surrounding country. These dunes finally sank down to a black floor as hard as flint with tongues of lava to the left, and to the right the slow descent into the cactus plain. Yaqui was now traveling due west.

It was Gale's idea that the Indian was skirting the first sharp-toothed slope of a vast volcanic plateau which formed the western half of the Sonora Desert and extended to the Gulf of California. Travel was slow, but not exhausting for rider or beast. A little sand and meager gra.s.s gave a grayish tinge to the strip of black ground between lava and plain.

That day, as the manner rather than the purpose of the Yaqui changed, so there seemed to be subtle differences in the others of the party.

Gale himself lost a certain sickening dread, which had not been for himself, but for Mercedes and Nell, and Thorne and the rangers. Jim, good-natured again, might have been patrolling the boundary line. Ladd lost his taciturnity and his gloom changed to a cool, careless air. A mood that was almost defiance began to be manifested in Thorne. It was in Mercedes, however, that Gale marked the most significant change.

Her collapse the preceding day might never have been. She was lame and sore; she rode her saddle sidewise, and often she had to be rested and helped; but she had found a reserve fund of strength, and her mental condition was not the same that it had been. Her burden of fear had been lifted. Gale saw in her the difference he always felt in himself after a few days in the desert. Already Mercedes and he, and all of them, had begun to respond to the desert spirit. Moreover, Yaqui's strange influence must have been a call to the primitive.

Thirty miles of easy stages brought the fugitives to another waterhole, a little round pocket under the heaved-up edge of lava. There was spare, short, bleached gra.s.s for the horses, but no wood for a fire.

This night there was question and reply, conjecture, doubt, opinion, and conviction expressed by the men of the party. But the Indian, who alone could have told where they were, where they were going, what chance they had to escape, maintained his stoical silence. Gale took the early watch, Ladd the midnight one, and Lash that of the morning.

The day broke rosy, glorious, cold as ice. Action was necessary to make useful benumbed hands and feet. Mercedes was fed while yet wrapped in blankets. Then, while the packs were being put on and horses saddled, she walked up and down, slapping her hands, warming her ears. The rose color of the dawn was in her cheeks, and the wonderful clearness of desert light in her eyes. Thorne's eyes sought her constantly. The rangers watched her. The Yaqui bent his glance upon her only seldom; but when he did look it seemed that his strange, fixed, and inscrutable face was about to break into a smile. Yet that never happened. Gale himself was surprised to find how often his own glance found the slender, dark, beautiful Spaniard. Was this because of her beauty? he wondered. He thought not altogether. Mercedes was a woman. She represented something in life that men of all races for thousands of years had loved to see and own, to revere and debase, to fight and die for.

It was a significant index to the day's travel that Yaqui should keep a blanket from the pack and tear it into strips to bind the legs of the horses. It meant the dreaded choya and the knife-edged lava. That Yaqui did not mount Diablo was still more significant. Mercedes must ride; but the others must walk.

The Indian led off into one of the gray notches between the tumbled streams of lava. These streams were about thirty feet high, a rotting ma.s.s of splintered lava, rougher than any other kind of roughness in the world. At the apex of the notch, where two streams met, a narrow gully wound and ascended. Gale caught sight of the dim, pale shadow of a one-time trail. Near at hand it was invisible; he had to look far ahead to catch the faint tracery. Yaqui led Diablo into it, and then began the most laborious and vexatious and painful of all slow travel.

Once up on top of that lava bed, Gale saw stretching away, breaking into millions of crests and ruts, a vast, red-black field sweeping onward and upward, with ragged, low ridges and mounds and spurs leading higher and higher to a great, split escarpment wall, above which dim peaks shone hazily blue in the distance.

He looked no more in that direction. To keep his foothold, to save his horse, cost him all energy and attention. The course was marked out for him in the tracks of the other horses. He had only to follow. But nothing could have been more difficult. The disintegrating surface of a lava bed was at once the roughest, the hardest, the meanest, the cruelest, the most deceitful kind of ground to travel.

It was rotten, yet it had corners as hard and sharp as pikes. It was rough, yet as slippery as ice. If there was a foot of level surface, that s.p.a.ce would be one to break through under a horse's hoofs. It was seamed, lined, cracked, ridged, knotted iron. This lava bed resembled a tremendously magnified clinker. It had been a running sea of molten flint, boiling, bubbling, spouting, and it had burst its surface into a million sharp facets as it hardened. The color was dull, dark, angry red, like no other red, inflaming to the eye. The millions of minute crevices were dominated by deep fissures and holes, ragged and rough beyond all comparison.

The fugitives made slow progress. They picked a cautious, winding way to and fro in little steps here and there along the many twists of the trail, up and down the unavoidable depressions, round and round the holes. At noon, so winding back upon itself had been their course, they appeared to have come only a short distance up the lava slope.

It was rough work for them; it was terrible work for the horses. Blanco Diablo refused to answer to the power of the Yaqui. He balked, he plunged, he bit and kicked. He had to be pulled and beaten over many places. Mercedes's horse almost threw her, and she was put upon Blanco Sol. The white charger snorted a protest, then, obedient to Gale's stern call, patiently lowered his n.o.ble head and pawed the lava for a footing that would hold.

The lava caused Gale toil and worry and pain, but he hated the choyas.

As the travel progressed this species of cactus increased in number of plants and in size. Everywhere the red lava was spotted with little round patches of glistening frosty white. And under every bunch of choya, along and in the trail, were the discarded joints, like little frosty pine cones covered with spines. It was utterly impossible always to be on the lookout for these, and when Gale stepped on one, often as not the steel-like thorns pierced leather and flesh. Gale came almost to believe what he had heard claimed by desert travelers--that the choya was alive and leaped at man or beast. Certain it was when Gale pa.s.sed one, if he did not put all attention to avoiding it, he was hooked through his chaps and held by barbed thorns. The pain was almost unendurable. It was like no other. It burned, stung, beat--almost seemed to freeze. It made useless arm or leg. It made him bite his tongue to keep from crying out. It made the sweat roll off him. It made him sick.

Moreover, bad as the choya was for man, it was infinitely worse for beast. A jagged stab from this poisoned cactus was the only thing Blanco Sol could not stand. Many times that day, before he carried Mercedes, he had wildly snorted, and then stood trembling while Gale picked broken thorns from the muscular legs. But after Mercedes had been put upon Sol Gale made sure no choya touched him.

The afternoon pa.s.sed like the morning, in ceaseless winding and twisting and climbing along this abandoned trail. Gale saw many waterholes, mostly dry, some containing water, all of them catch-basins, full only after rainy season. Little ugly bunched bushes, that Gale scarcely recognized as mesquites, grew near these holes; also stunted greasewood and p.r.i.c.kly pear. There was no gra.s.s, and the choya alone flourished in that hard soil.

Darkness overtook the party as they unpacked beside a pool of water deep under an overhanging shelf of lava. It had been a hard day. The horses drank their fill, and then stood patiently with drooping heads.

Hunger and thirst appeased, and a warm fire cheered the weary and foot-sore fugitives. Yaqui said, "Sleep." And so another night pa.s.sed.

Upon the following morning, ten miles or more up the slow-ascending lava slope, Gale's attention was called from his somber search for the less rough places in the trail.

"d.i.c.k, why does Yaqui look back?" asked Mercedes.

Gale was startled.

"Does he?"

"Every little while," replied Mercedes.

Gale was in the rear of all the other horses, so as to take, for Mercedes's sake, the advantage of the broken trail. Yaqui was leading Diablo, winding around a break. His head was bent as he stepped slowly and unevenly upon the lava. Gale turned to look back, the first time in several days. The mighty hollow of the desert below seemed wide strip of red--wide strip of green--wide strip of gray--streaking to purple peaks. It was all too vast, too mighty to grasp any little details. He thought, of course, of Rojas in certain pursuit; but it seemed absurded to look for him.

Yaqui led on, and Gale often glanced up from his task to watch the Indian. Presently he saw him stop, turn, and look back. Ladd did likewise, and then Jim and Thorne. Gale found the desire irresistible.

Thereafter he often rested Blanco Sol, and looked back the while. He had his field-gla.s.s, but did not choose to use it.

"Rojas will follow," said Mercedes.

Gale regarded her in amaze. The tone of her voice had been indefinable. If there were fear then he failed to detect it. She was gazing back down the colored slope, and something about her, perhaps the steady, falcon gaze of her magnificent eyes, reminded him of Yaqui.

Many times during the ensuing hour the Indian faced about, and always his followers did likewise. It was high noon, with the sun beating hot and the lava radiating heat, when Yaqui halted for a rest. The place selected was a ridge of lava, almost a promontory, considering its outlook. The horses bunched here and drooped their heads. The rangers were about to slip the packs and remove saddles when Yaqui restrained them.

He fixed a changeless, gleaming gaze on the slow descent; but did not seem to look afar.

Suddenly he uttered his strange cry--the one Gale considered involuntary, or else significant of some tribal trait or feeling. It was incomprehensible, but no one could have doubted its potency. Yaqui pointed down the lava slope, pointed with finger and arm and neck and head--his whole body was instinct with direction. His whole being seemed to have been animated and then frozen. His posture could not have been misunderstood, yet his expression had not altered. Gale had never seen the Indian's face change its hard, red-bronze calm. It was the color and the flintiness and the character of the lava at his feet.

"Sh.o.r.e he sees somethin'," said Ladd. "But my eyes are not good."

"I reckon I ain't sure of mine," replied Jim. "I'm bothered by a dim movin' streak down there."

Thorne gazed eagerly down as he stood beside Mercedes, who sat motionless facing the slope. Gale looked and looked till he hurt his eyes. Then he took his gla.s.s out of its case on Sol's saddle.

There appeared to be nothing upon the lava but the innumerable dots of choya shining in the sun. Gale swept his gla.s.s slowly forward and back. Then into a nearer field of vision crept a long white-and-black line of horses and men. Without a word he handed the gla.s.s to Ladd.

The ranger used it, muttering to himself.

"They're on the lava fifteen miles down in an air line," he said, presently. "Jim, sh.o.r.e they're twice that an' more accordin' to the trail."

Jim had his look and replied: "I reckon we're a day an' a night in the lead."