PROF. ERWIN BAUR is well known to students of genetics as a most successful investigator. The fifteen lectures included in the present volume were delivered as a course in Berlin, and they constitute an admirable text-book of the subject, which will do much to familiarise Continental biologists with the methods of Mendelian analysis and the deductions to which it has led. The coloured pictures are exceptionally good. No clearer or better illustrated account of the present state of knowledge of these matters could be desired. Einfhrung in die experimented Vererbungslehre By Prof. E. Baur. Pp. vi + 293. (Berlin: Gebrder Borntraeger, 1911.) Price 8.50 marks.