Topley & Wilson has been regarded highly as a textbook ever since the first edition. Its good reputation has increased with the second edition, and there is little doubt that the present greatly enlarged third edition will add to the already large number of students who have learned to depend on Topley & Wilson as the reliable counselor in matters bacteriologic and immunologic.
Despite the double handicap of Professor Topley's death in January 1944 and the war, with the limitation of accessibility to foreign sources as only one of its many hardships, the new edition has been brought up to date and expanded. Two new chapters, on chemotherapy and on the bacteriology of air, have been added; one on soil microbiology has been left out. Separate chapters have been formed for the Shigella, the Salmonella and the psittacosis-lymphogranuloma group. In other respects the structure and treatment remain unchanged, which is