This monograph by two British physicians gives detailed coverage of every aspect of leptospirosis, a disease in which man is an accidental host of the causative organism. The true host is the family Muridae (rats, mice, voles, lemmings, and others). In so far as possible, the book is written in historical sequence. Section 1 discusses the morphology, classification, physiology, and distribution of Leptospires; section 2, leptospirosis in man, with a contributed chapter on the legal aspects in England and Wales of the contraction of leptospirosis; section 3, leptospirosis in animals; and section 4, leptospirosis in regions most affected. This is followed by an appendix dealing with culture mediums and laboratory techniques, a list of books and a list of references to periodical literature, a subject index, and an author index. The authors are to be commended for bringing a large amount of material together in one authoritative volume.