This is planned to meet the needs of medical men who desire a special course in protozoology but have only brief time. The authors refuse to follow the zoological arrangement and after a brief introduction plunge into malaria, which in various subsections covers a sixth of the book. Then coccidiosis, piroplasmosis, the hemogregarines and the gregarines occupy about the same space. After these come amebas, flagellates, including chiefly Leishmania and Trypanosoma, ciliata, sarcocysts, spirochetes with Treponema and Leptospira, and numerous other forms incidentally treated. Each teacher will have, of course, his own way of treating a subject, but it is difficult to see how students can handle the extensive discussions in some chapters without more general knowledge than is given them here. One also wonders why it is advantageous to follow the sequence employed, which has been frankly chosen by the authors with intent to disregard zoological relationships; i. e.,