The addition of new terms in medicine and the allied sciences is rapid enough to justify the publication of a new edition of any medical dictionary every three or four years. Since it has been seven years since the first edition of this book was published, the new volume is most welcome and most useful. A table of radioactive and other isotopes commonly used in medicine has been added to the appendix. All illustrations have been grouped together in the center of the book. This arrangement is a convenience for the printer rather than the reader. There have been many changes in the list of contributors. For many years this dictionary and its predecessor, Gould's Medical Dictionary, have been of top quality. The publication of this revision assures it of maintaining that position.