This volume mainly includes, as the author states in his preface, the subject-matter of a portion of his lectures on general hygiene, at the University of Pennsylvania. As the result of practical teaching experience, therefore, they have a value, and the book, it may be said, on the whole, meets expectations. It is well and clearly written, and contains a large amount of valuable information for the student, though there is not so much in it that ought to be new to the well-qualified physician. Like most other works that deal with vital statistics, it is occasionally a little misleading; the table on page 35, for example, would lead one to believe that the foreign-born were largely immune from scarlet fever, diphtheria, measles, whooping-cough, and other children's diseases, whereas it is really the scarcity of foreign-born infants that accounts for the figures. The author notices the fallacies of statistics in