The correct interpretation of pain, either that which occurs spontaneously and is complained of by the patient, or that which is manifested only on careful objective examination, is one of the most difficult yet important tasks imposed on the physician. The value of pain as an early indicator of disease and as evidence of the progress of disease is well known to both physician and layman. The difficulty of correctly interpreting pain is, however, properly appreciated only by physicians, and particularly by such physicians as check up on their diagnoses by careful study of the later histories of their patients, with, where possible, the revelations of autopsy. Schmidt has had an ample clinical material at his command, has controlled many diagnoses by autopsy, and has profited by the traditions and examples of such masters of diagnostic detail as Bamberger and Neusser. In this book, therefore, we find a discussion of