many hours were over. My stay at Stanley Pool, though it involved some most unpleasant work, taught me much which was afterwards of use.

The doctor was generally ill, and his duties devolved almost entirely upon me. The station was badly supplied with provisions, and, as a consequence, both the white and black men were thoroughly out of health. More than half the black soldiers were suffering from ulcerated legs and feet — huge gangrenous sores, which at first resisted all treatment. Later on, I found that the probable cause of this state of things was a want of salt; for, when some months afterwards we were in the Lualaba district, in which salt is plentiful, these ulcers were never seen except in troops arriving from downriver. On several occasions a whole contingent suffering from these loathsome ulcers joined