Professor _Merriman's_ _Elements of Sanitary Engineering_[E] is a thoroughly practical treatise setting forth the principal rules and laws relating to sanitation, both individual and municipal, as it is practiced to-day. A brief historical introduction is followed by a classification of diseases, and a general consideration of such questions as filth and disease, impure air and disease, drinking water and disease, etc. The second chapter takes up the question of the purification of water. Chapter III discusses the practical aspects, for a municipality, of water-supply systems. Consumption of water, capacity of storage reservoirs, pipe lines, pumping engines, tanks and stand pipes and street mains are among the special headings. Sewerage systems are next dealt with. A discussion of questions connected with the disposal of garbage and sewage forms the fifth and last chapter of the book. An item which adds value to the volume is the series of exercises and problems, practically applying the laws set forth, which follows each chapter. _An Epitome of Human Histology_[F] has been written by Mr. _Weysse_ to meet the difficulty in which the conscientious student of microscopic anatomy is placed who finds himself in possession of a great many isolated facts about the minute structure of the body, but with rather an indefinite conception of the relation of those facts to one another and of the subject as a whole. In the writing the author has sought to present all the facts that are of real importance to the student; to express them in the briefest and clearest language, omitting whatever is not strictly required; and to arrange them in such a way that the reader, in considering any organ, may, if he will, actually sketch each part as he proceeds, and thus make a diagrammatic plan or picture of the entire structure. The book is not for idle students, but for serious ones, and it is not a text-book or intended to take the place of one; and it can serve its true purpose only when used by students who have had laboratory practice as well as lectures in histology, and have thus examined the actual structures.