Captains Speke and Grant divided the duties of the expedition between them, the first mapping the country, which is done by timing the rate of march, taking compass-bearings, noting the water-shed, etcetera. Then, on arriving in camp, it was necessary to boil the thermometer to ascertain the altitude of the station above the sea-level, and the latitude by the meridional altitude of a star; then, at intervals of sixty miles, lunar observations had to be taken to determine the longitude; and, lastly, there was the duty of keeping a diary, sketching, and making geological and zoological collections. Captain Grant made the botanical collections and had charge of the thermometer. He kept the rain-guage and sketched with water colours, for it was found that photography was too severe work for the climate. The march was pursued before the sun was high, then came breakfast and a pipe before exploring the neighbourhood, and dinner at sunset, then tea and pipe before turning in at night. Scarcely had they commenced the journey than the petty chiefs demanded tribute, which it was necessary to pay. The porters also struck for higher wages; but, the leaders going on, they thought better of the matter, and followed. The poor Hottentots suffered much from the climate, and were constantly on the sick-list. The Waguana treated them with great contempt, and one day, while a little Tot was trying to lift his pack on his mule a large black grasped him, pack and all, in his muscular arms, lifting them above his head, paraded him round the camp amid much laughter, and then, putting him down, loaded his mule and patted him on the back. "A day's march being concluded, the sheikh and Bombay arrange the camp, issuing cloths to the porters for the purchase of rations, the tents are pitched, the Hottentots cook, some look after the mules and donkeys, others cut boughs for huts and fencing, while the Beloochs are supposed to guard the camp, but prefer gossiping and brightening their arms, while Captain Grant kills two buck antelopes to supply the larder." The country through which they were passing belongs to to the tribe of Wazaramo. It is covered with villages, the houses of which are mostly of a conical shape, composed of hurdle-work and plastered with clay, and thatched with grass or reeds. They profess to be the subjects of the Sultan of Zanzibar. They are arrant rogues, and rob travellers, when they can, by open violence. They always demand more tribute than they expect to get, and generally use threats as a means of extortion. One of their chiefs, the Lion-Claw, was very troublesome, sending back the presents which had been made him, and threatening dire vengeance if his demands were not complied with. Further on, Monkey's-Tail, another chief, demanded more tribute; but Speke sent word that he should smell his powder if he came for it; and, exhibiting the marksmanship of his men, Monkey's-Tail thought better of it, and got nothing.