Here are included the Fitzpatrick lectures, which deal with smallpox, chickenpox, scarlet fever, measles and German measles. J. D. Rolleston writes in a most interesting manner. He has made a thorough search of the periodical literature relating to the diseases with which he was concerned and he has an adequate appreciation of the nature of medical progress. He has accepted the contribution of Drs. George and Gladys Dick as well established. He seems to have failed, however, to realize that the Koplik spots had been adequately described previous to the excellent contribution made by Koplik on this subject. The book is illustrated with excellent plates of some of the greatest contributors to the subject.