Recent years have seen the appearance of several American textbooks on animal parasitology, and this year they were augmented by Strong's comprehensive revision and enlargement of Stitt's textbook on tropical diseases and by Belding's book on clinical parasitology.
To the present time there had not appeared an authoritative "small book useful chiefly to medical students and medical practitioners, in which these persons will find a résumé of the significant information upon the animal parasites of medical importance." This gap the author seeks to fill.
The task is not an easy one, and Dr. Culbertson is to be congratulated on having presented a useful textbook. As was to be expected, in view of the author's special interests, the discussions of natural resistance, acquired immunity and immunologic procedures, though concise, are of particular value. Tabulations of such material as "the route of infection, final site of residence and chief effects of the