The scope of this book has been enlarged and its size increased in order to permit the inclusion of many important advances in laboratory technic. Each section has been carefully revised, additions being especially made to those on sputum, urine and animal parasites. Among the newer methods noted are Weisz' test for urochromogen, Ponder's stain for diphtheria bacilli and the urease method for urea. A new chapter on serodiagnostic methods has been added by Dr. Ross C. Whitman. While this manual is not so complete as many of the works on clinical diagnosis, it is sufficiently comprehensive for the student (for whom it is intended) and for the general worker who may wish to become familiar with the more common as well as with the newer methods of laboratory examination. The text is clear and concise. The illustrations are adequate and instructive.