On the afternoon of a certain day in spring a party of eighteen men was marching through the rocky, bush-covered country near the north-western corner of Lake Chad, in Northern Nigeria. It consisted of two white men, in khaki and sun helmets, and sixteen stalwart Hausas, wearing nothing but their loin-cloths, but carrying on their heads boxes and bundles of all shapes and sizes. The white men and nine of the negroes had rifles slung over their backs. They were marching wearily. Since early morning, almost without stopping, they had been trudging their toilsome way over parched and barren land, only once discovering a water-hole at which they were able to slake their burning thirst. For the greater part of the day the sun had beat upon them fiercely; but the sky was now overclouded, and a keen north-east wind had sprung up--the harmattan of the desert--blowing full in their faces, stinging their skins and filling mouths and ears and nostrils with the particles of fine grey dust which it swept along in its desolating course. The jaded carriers, who were wont to enliven the march with song and chatter, were now silent. The two Englishmen in advance, bending forward to keep the grit out of their eyes, tramped along, side by side, with an air of dejection and fatigue. "We are down on our luck, old man," said Hugh Royce presently, turning his back upon the wind. "The village can't be far away, if Drysdale's map is correct; but we can't go on much farther without a long rest." "It's rank bad luck, as you say," replied Tom Challis. "It's not as if we had been over-marching; we've really taken it pretty easy; but we didn't reckon with sickness. These Hausas look as strong as horses, but I doubt whether half of them will be able to lift their loads to-morrow." "When we get to the village, we'll let them slack for a day or two, and dose them well. I'll tell John; it will encourage them to stick it a little longer." He beckoned up a strapping negro, the head-man of the company, upon whom a former employer had bestowed the name John in place of his own--a succession of clicks and gurgles which white men found unpronounceable. Telling him the decision just come to, the leader of the expedition ordered him to acquaint the men with it, and urge them to persevere a little longer. The weary, willing carriers perked up a little at the prospect of a holiday, and began to talk to one another of how much they would eat. It did not matter, they agreed, if they made themselves ill, for the little balls out of the white men's bottles would soon set them to rights again. Hugh Royce was one of those hardy persons whom wealth does not spoil. Inheriting, at the age of twenty-three, a large fortune from an uncle, he resolved to realise his dearest ambition--to travel into some little-known region of the world, not for mere sport, but to study its animals and birds, and add something to the general stock of knowledge.