Human Histology

tion and overt disease, we should study the factors which influence the conversion of the former to the latter. The second new chapter is Chapter 34 on "Chemotherapy of Microbial Diseases" by Dr. Walsh McDermott, who has done extensive work with the tubercle bacillus in recent years. This and the preceding chapter on chemotherapeutic principles are really a division of a single chapter in the previous edition, but the division is a logical one and makes for better organization. His discussion of in vivo drug-parasite relationships has been expanded, and the section on resistance as related to multiple drug therapy is especially timely. Many chapters have been revised extensively, but several are essentially the same. The chapter on serology and immunochemistry has been expanded and includes such novel concepts as immune adherence and the properidin system. The chapter on bacterial morphology, physiology, and genetics has been changed appreciably too, especially with the inclusion of new material on the mutation of bacteria. The book itself is an attractive one; the paper is high grade and the illustrations are well done. The bibliography has been cut down (and this is perhaps the only factor not in favor of this edition) as well as the size of the print to keep the size of the volume to a minimum. Also, thanks to The National Foundation we are able to purchase Bacterial and Mycotic Infections of Man for an attractive price-a rare happening these days.