"I have a notion," was all he would reply to the questions of the boys.

He and the boys and von Hofe rode first, the Masai tramping along to a swinging chant beside the wagon, and the three gun-bearers bringing up the rear. The oxen did not require any driving, as they followed the leaders unhesitatingly and patiently.

"I guess we've got our work cut out for us," said Charlie as the long, rolling white-dusted plain opened out before them in the moonlight. He and Jack rode together, as usual.

"Seems weird," replied Jack, "to think o' Mowbray coming across here on a camel only to die, an' us going back on the same trail. Wonder how that camel died in five days?"

"I don't know. He said it was unhurt. Prob'ly the Arab pushed it day and night at full speed. Even a camel would go down under that."

As they advanced, the dust rose in clouds about them, hanging low and choking the Indians behind until they had to come forward. Once or twice the barking call of a zebra sounded from the distance, and toward morning the distant growl of a lion, but no other signs of life came to them.

The boys had been busy all day, and they were tired enough to doze off in the saddle as they went forward, the white dust covering them all with a thick coating. Hour after hour they plodded on, at intervals wiping out the nostrils of the horses and cattle with a wet cloth by way of refreshment. Von Hofe chatted intermittently with Schoverling, who guided the march by compass, but the boys were too weary for talk.

At five o'clock they halted on the edge of a dry water-course. They had not omitted to fetch along a good supply of fodder for the cattle, which was loaded in the wagon to the very top of the tilt. The horses were given a few swallows of water each, the Masai dined on roast meat about their fires, while the four explorers and the Indians made an excellent repast on cold meat and biscuits with tea. Biscuits were Charlie's specialty, and before the start he had made a good supply, as their flour was running low.

For three hours they rested here, Schoverling and Jack keeping watch in turn. At the next halt von Hofe and Charlie would stand guard, then the three Indians. At eight the cattle were inspanned, and they plodded onward until noon, hot and choked with dust. No complaint came from the Masai, and here the second meal of the day was eaten.

The boys had thought that first march across that almost deserted grass plain was hard, but this gave them an inkling of the meaning of an African trek. They slept with heads on their saddles, the single tent they had brought along shading them somewhat. The Indians and a few Masai slept on the fodder beneath the hood of the wagon, the rest stretched out under the wagon itself.