As an atlas—and this is the real nature of the work—this book is valuable, not to the beginner so much as to the one who is already familiar with the technic of hematology and has had practical experience with it at the bedside. The plates are neat, clearly executed, well colored, artistic and yet true to nature. The descriptions of illustrations are terse yet plain, and brief case histories often add to the interest. The selection of blood preparations has been well made, showing the typical appearances of normal blood, the leucocytoses, the anemias, leukemias, etc., usually in the stained specimen, though occasionally in the unstained. Schleip prefers to make the examination of the unstained specimen between two films and in a hanging-drop chamber, with the blood diluted with physiologic salt solution. The erythrocyte under these circumstances crenates less and shows some peculiarities of form that he believes are more