THIS will prove a useful book for students. It is arranged in forty-two lessons and appendix. Each lesson commences with a short statement of methods for the microscopic examination of the tissue described in the lesson. All simple tissues and organs are thus passed in review, and their most essential characters are succinctly described and illustrated. It is to be regretted that Prof. Schafer has deviated from the customary plan of giving some kind of reference both for the text and the illustrations. The latter are mostly taken from Prof. Schafer's portion of Quain's Anatomy, and their original source, although mentioned in Quain's, is here omitted. The Essentials of Histology. By E. A. Schafer. (London: Longmans, Green and Co., 1885.)