There are already many excellent books on medical diagnosis. It must have taken a good deal of courage for Dr. Wilson to come on the stage asking the favor of the medical audience for still another work on the same subject. His justification for such an act is, as he tells us in the preface, not only the expressed wishes of colleagues and the needs of successive classes of pupils, but the conviction that something different in method and a new arrangement of details were urgently needed. We confess that before looking at the book critically we were skeptical as to finding much that was new, even in arrangement and method of handling. But it is a pleasure to state that the author has fulfilled his promise and an eminently satisfactory book is the result. The four parts into which the book is divided are: (1) "Medical Diagnosis in General;"