They both knew Hindustani; but while Rahan's services at sea had been short, Baraka had served nearly all his life with Englishmen--was the smartest and most intelligent negro I ever saw--was invaluable to Colonel Rigby as a detector of slave-traders, and enjoyed his confidence completely--so much so, that he said, on parting with him, that he did not know where he should be able to find another man to fill his post.

These two men had now charge of our tents and personal kit, while Baraka was considered the general of the Wanguana forces, and Rahan a captain of ten.
My first occupation was to map the country.

This is done by timing the rate of march with a watch, taking compass-bearings along the road, or on any conspicuous marks--as, for instance, hills off it--and by noting the watershed--in short, all topographical objects.

On arrival in camp every day came the ascertaining, by boiling a thermometer, of the altitude of the station above the sea-level; of the latitude of the station by the meridian altitude of the star taken with a sextant; and of the compass variation by azimuth.

Occasionally there was the fixing of certain crucial stations, at intervals of sixty miles or so, by lunar observations, or distances of the moon either from the sun or from certain given stars, for determining the longitude, by which the original-timed course can be drawn out with certainty on the map by proportion.