Heavy paper, good-sized type, fine workmanship, an excellent glossary, and most of the illustrations on plates, with some in colors, characterize this small volume. Experience and knowledge of the literature of hematology are evident from the brief convincing descriptions in choice English. The Greek suffix "osis" unfortunately has a double significance. It often means causation, as in actinomycosis; and often simply excess, as in adiposis. The storm of disapproval with which introduction of the term "nephrosis" was received is easily recalled. Erythrosis, myelosis and leukosis, implying hyperplasia of tissues where different blood cells are produced, may not meet with favor. Changes of the blood are set forth, but with fully as much attention to those concomitant in the hemoblastic tissues. Some of the other diseases of these parts, such as lymphosarcoma and Hodgkin's disease, in which the blood may be quite normal, are also portrayed. They are approached from the