Professor Kato has had two medical lives, one in Chicago for many years until the outbreak of the War with Japan, and the second in Tokyo. While in Chicago, where he was one of the first pediatric hematologists, his hobbies were the collection of interesting blood smears and the meticulous painting of blood cells. In more recent years, he has been director of a hematology service in Tokyo, in direct supervision of a blood bank, and has been interested in hemorrhagic disorders.
This atlas was begun years ago when Kato was in Chicago. There was then a long interval in which a war was fought. When it was concluded, the old work was resumed. The atlas was first published in Japan. Fortunately, the colored lithographs are the same as in the Japanese editions. The paintings of blood and bone marrow smears are beautifully reproduced at × 1,000 magnification and possess