Some Notes on Mapping and Prospecting in Central Africa. By
C. Grey. (Hugh Rees.)—Mr. Charles Grey has summarized In this little book the lessons of long years of experience in Africa. "Probably there is no country," he says, "possessing such great natural attractions where work and sport can be combined so closely and interfere so little with each other, or where they can be carried on with such perfect freedom of movement." He goes on to explain a simple method of route- mapping with a prismatic compass and watch, and a sextant for daily obstrvations of latitude. He gives some notes on the preliminary search for minerals, a fascinating chapter on canvas boats, and directions for crossing rivers. There is also a chapter on the bicycle, for which, it seems, the native path well trodden by native feet is peculiarly well adapted ; no African traveller should be without his bicycle, and "it is wise to make a rule never to dismount except when it is absolutely necessary." Mr. Grey illustrates his book with some remarkable photographs of African scenery. We commend it to the attention of travellers, whose route-maps would be useful to the professional map-maker.
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