This is practically the fourth edition of the Principles of Hygiene, published in 1884, 1888 and 1893. This is specially adapted to English professional examinations and the arrangement is made accordingly, each chapter ending with a series of questions on the subjects discussed. The book is one that we should consider well adapted for students' use, and, while arranged especially for English students, it might be used with profit in this country. It covers the whole ground of hygiene, not only the more exclusive medical side, but also the subjects of vital statistics, demography, meteorology, etc. We find here and there a little that may be open to question and some matters may arise in this country that are not fully treated of, which is to some extent a defect in the work for American students. Taking it altogether, it is a valuable book and one well worthy the attention