These palisades seem to indicate a sense of insecurity in regard to their fellow-men, for there are no wild beasts to disturb them; the bows and arrows have been nearly as efficacious in clearing the country here as guns have in the country farther south.

This was a disappointment to us, for we expected a continuance of the abundance of game in the north which we found when we first came up to the confluence of the Leeba and Leeambye.
A species of the silver-tree of the Cape ('Leucodendron argenteum') is found in abundance in the parts through which we have traveled since leaving Samoana's.

As it grows at a height of between two and three thousand feet above the level of the sea, on the Cape Table Mountain, and again on the northern slope of the Cashan Mountains, and here at considerably greater heights (four thousand feet), the difference of climate prevents the botanical range being considered as affording a good approximation to the altitude.

The rapid flow of the Leeambye, which once seemed to me evidence of much elevation of the country from which it comes, I now found, by the boiling point of water, was fallacious.* * On examining this subject when I returned to Linyanti, I found that, according to Dr.Arnott, a declivity of three inches per mile gives a velocity in a smooth, straight channel of three miles an hour.

The general velocity of the Zambesi is three miles and three quarters per hour, though in the rocky parts it is sometimes as much as four and a half.