The subject was argued with much learning, and a large map was exhibited to illustrate the views of the author. Some of the more striking points of difference between this map and the recent ones of Livingstone were the total separation of the rivers Liambeji and Zambesi (the upper and lower courses of the Zambesi) and the release of their affluents from the system of inosculation which, in recent maps, bind all those rivers together; and the northwest direction of Lake Nyassa, which was made continuous with Tanganyika, forming an elongated lake, called Nanja mucuro.