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266 But this strong, thirsty wind, coming from the north-western deserts with a clear fetch of a thousand miles, was not going to last many hours; meantime, I set myself to work out scientifically its genesis, operation, and hidden purpose. The first and second considerations were merely matters of research and calculation; the third was largely speculative, admitting of no more definite conclusion than that the time had come when hygienic necessities required a thorough rousing and ridding-out of microbes, bacteria, and other pests too minute to be worth particularising. But I was better enlightened before another day had gone over my head.

Whilst engaged in these not unpleasing studies, I caught a momentary glimpse of something, ten yards away to the left, which seemed to be moving slowly against the wind. The volume of flying dust was, of course, far from uniform in density; and presently I caught sight of the object again. It was a man, creeping slowly and painfully across the stubbly knobs of cotton-bush on his hands and knees. I hailed him in a voice that took the skin off my throat, but another glimpse showed him still travelling; his head bent almost to the ground. I rose carefully to my feet, facing the shower, but only to be hurled down on top of the faithful Pup, and savagely snapped at. Then I went like a quadruped till I reached the wayfarer, and caught him by the ankle. He looked round; I beckoned, and crept back to my former seat, whilst he followed close behind. Then a bearded, haggard, resolute face, framed by an old hat tied down over the ears, confronted me.

"You look like some worn and weary brother, pulling hard against the stream," I shouted.

The dry, cracked lips moved without speech, and the bloodshot eyes left my face to scan the pack-saddle beside me.

"Water?" I suggested.

He nodded. Cleopatra was close behind me, propped against the wind. I drew myself up by the near stirrup, till I could unbuckle the water-bag from the cantle. Though filled with half a gallon of water not two hours before, it was now half-empty. I drew the cork; my visitor clasped the cool, damp canvas between his trembling hands, and, with fine self-control, barely wetted his lips again and again. At last he took a moderate drink.

"Making for Patagonia Tank," he hoarsely remarked.

"You were going past it. It's about a mile and a half straight across there. I've just come from it."

"Disappointed of water last night," he continued. "It was dark when I struck the little tank I was making for, and I found her dry; and my throat like a lime-kiln. Too dog-tired to go any further, so I rested till morning, and then struck for the Patagonia, with a devil of a headache to help me along. I knew of another tank nearer, but I would n't trust myself to find her in the dust. I helped to sink the Patagonia. Fine tank—ain't she?"

"First-class. Have you no swag?"

"I had a very good one a few hours ago, but Lord knows where she