Assuming the oryx to be where Hendrick affirmed he had seen their horns, we had to endeavour to give the animals our wind from the proper distance. In hunting the oryx one has to follow a method opposite to that followed in the case of all other game. If one got their wind, failure was a foregone conclusion, for the oryx cannot run down the wind. To keep up the necessary supply of oxygenated blood to his mighty muscles he must run--his wide nostrils expanded like funnels--against the air-current. Should he attempt to run down the wind he would smother when hard pressed. This both he and the hunter know, so the great art in the noble sport of oryx-hunting lies in manoeuvring so as to prevent the game from taking the only course on which his powers will have full play. The day promised to be hot; when the Kalihari wind blows in summer there is no possibility of cool weather in the desert. We advanced at a walking pace, for the strength of our horses had to be conserved against that long pursuit which, in hunting the oryx, is almost inevitable. The heat grew greater every moment. The morning was at seven; what would the sunshine be like at noon? We reached the western limit of the ridge,--where the gentle slope merged itself almost imperceptibly into the plain. This was the juncture at which to exercise caution; one false move then, and our day would have been wasted. We dismounted and stole cautiously to our right--Hendrick and I,--Andries remaining with the horses. A low "s-s-s-t" from Hendrick, and we dropped in our tracks to the ground. The keen-eyed Hun had again discerned the tips of the "black sticks" over the rim of the earth-curve. We crept back to Andries and the horses, held a council of war and finally decided upon our strategy. Andries was heavily built; almost corpulent. This to him was a matter of great grief. His mount was strong, but no horse that ever was foaled could, with sixteen stone on its back, run down a herd of oryx. Hendrick and I, accordingly, were to do the riding. The game was still several miles away, on our left front as we turned and faced the camp, but it nevertheless was necessary that we should make another wide sweep so as to get further to windward. So we rode off northward, leaving Andries behind. He decided to remain where he was, it being an even chance as to whether the herd, after it had started, would break past him or to the north-eastward. In any event its course would not be more than 45 degrees on either side of the point from which the wind was blowing. Andries, moreover, had an almost uncanny knack of forecasting the movements of wild animals.