This book is written by an expert and a novice, and designed for readers who approach the subject in a condition of complete ignorance; accordingly, nothing is taken for granted. Only rudimentary instruction is imparted, but this is given with absolute simplicity and clearness. THE MIGRATIONS OF FISH. By ALEXANDER MEEK, M.Sc., PROFESSOR OF BIOLOGY, ARMSTRONG COLLEGE, IN THE UNIVERSITY OF DURHAM, AND DIRECTOR OF THE DOVE MARINE LABORATORY, CULLERCOATS. _With 12 Plates and 128 Diagrams and Maps. xvi + 416 pages._ _Demy 8vo._ =16s. net.= This work deals with a very interesting and important subject, which appeals no less to the layman than to the scientific student. The habits of sea-fish have only recently begun to be investigated seriously, but their importance in connection with our great fishing industries can hardly be overestimated. A great deal of information relating to the migrations of fish has already been accumulated, but it is scattered in books and periodicals frequently difficult to obtain. The author has aimed at giving a systematic account of the knowledge acquired, developing at the same time a theory of migrations based upon the various stages in the growth of fish in connection with currents. The book contains descriptions of the spawning habits, the eggs and the young, the passive drift to the feeding grounds, and the distribution of the species due to migrations. Practically all families of fish have been considered, but the important food fishes of the Northern Hemisphere have received specially detailed treatment. THE PRINCIPLES OF ELECTRICAL ENGINEERING AND THEIR APPLICATION. By DR. GISBERT KAPP. PROFESSOR OF ELECTRICAL ENGINEERING IN THE UNIVERSITY OF BIRMINGHAM; PAST PRESIDENT OF THE INSTITUTION OF ELECTRICAL ENGINEERS. _In Two Volumes, fully illustrated._ _Volume I.: Principles. Demy 8vo._ =15s. net.= [_Ready._ ⁂ _Volume II. is almost completed, and will be ready shortly._ =Recent Books on the War.= _Second Impression now ready._ VERDUN TO THE VOSGES. IMPRESSIONS OF THE WAR ON THE FORTRESS FRONTIER OF FRANCE. By GERALD CAMPBELL. SPECIAL CORRESPONDENT OF “THE TIMES” IN THE EAST OF FRANCE. _With Illustrations and Maps. Demy 8vo._ =10s. 6d. net.=