He had traveled only a little distance when clouds of sand and dust, wind-driven, enveloped him, blinding him again, stinging his face and hands and blotting out the landmarks upon which he depended to guide him to the Circle Bar. The sky had grown blacker; even the patch of blue that he had seen in the rift between the distant mountains was now gone. There was nothing above him--it seemed--except inky black clouds, nothing below but chaos and wind. He could not see a foot of the trail and so he gave the pony the rein, trusting to its instinct. When Norton had provided him with an outfit the inevitable tarpaulin had not been neglected. Hollis remembered that this was attached to the cantle of the saddle, and so, after he had proceeded a little way along the crest of the ridge, he halted the pony, dismounted, unstrapped the tarpaulin, and folded it about him. Then he remounted and continued on his way, mentally thanking Norton for his foresight. The pony had negotiated the ridge; had slowly loped down its slope to a comparatively low and level stretch of country, and was traveling steadily forward, when Hollis noticed a change in the atmosphere. It had grown hot again--sultry; the heat seemed to cling to him. An ominous calm had succeeded the aerial disturbance. From a great distance came a slight sound--a gentle sighing--gradually diminishing until it died away entirely. Then again came the ominous, premonitory silence--an absolute absence of life and movement. Hollis urged the pony forward, hoping the calm would last until he had covered a goodly part of the distance to the Circle Bar. For a quarter of an hour he went on at a good pace. But he had scarcely reached the edge of a stretch of broken country--which he dreaded even in the daylight--when the storm was upon him. It did not come unheralded. A blinding flash of lightning illuminated miles of the surrounding country, showing Hollis the naked peaks of ridges and hills around him; gullies, draws, barrancas, the levels, lava beds, fantastic rock shapes--mocking his ignorance of the country. He saw them all for an instant and then they were gone and darkness--blacker than before--succeeded. It was as though a huge map had suddenly been thrust before his eyes by some giant hand, an intense light thrown upon it, and the light suddenly turned off. Immediately there came a heavy crash as though the Storm-Kings, having marshalled their forces, had thrown them together in one, great, clashing onrush. And then, straight down, roaring and shrieking, came the deluge. The wise little plains-pony halted, standing with drooping head, awaiting the end of the first fierce onslaught. It lasted long and when it had gone another silence, as ominous as the preceding one, followed. The rain ceased entirely and the pony again stepped forward, making his way slowly, for the trail was now slippery and hazardous. The baked earth had become a slimy, sticky clay which clung tenaciously to the pony's hoofs.