This edition, following the third by four years, is considerably amplified, covering new material in the field of medical laboratory procedures as well as adding many useful charts and illustrations. If one keeps in mind the possibility of errors of omission in so comprehensive a technical book and the rapid development of newer methods, this is no doubt the most useful general reference book for medical technologists.
It is, of course, not a complete laboratory manual in any one subject. It omits, for example, details of Salmonella and Shigella typing now in wide use, and it gives some misleading statements, such as the implication of the value of stained smear diagnosis of Trichomonas vaginalis. There is no discussion of toxoplasmosis and only a bare mention of histoplasmosis. The hematologic illustrations do not compare with the excellent charts and the text in this field. Because of condensation, the book could not