In this remarkable book, chapters 1 and 2, called Principia Diagnostica, deal with a subject not found in any other modern book. Ordinarily the subject of logic and diagnosis is acquired by the student in ward work in a rather haphazard fashion. By some it is not acquired after a lifetime of practice. Instruction in this subject should be helpful to the intelligent student. The book covers practically the entire field of diagnosis in the realms of medicine and surgery and is replete with stimulating quotations and references to original work. The semicolloquial style of writing will appeal to most students. By and large the book, with its homely line drawings and photographs, is worth the reading for any student of medicine.