This volume is intended for the class room and laboratory more than the library, and as such will be found a trustworthy guide. Section IX, on "practical work" is very useful. The study of embryology has been too much neglected in medical schools in the past, and this book has been prepared in recognition of the evident need of medical students for a compact book on the subject. While it only purports to give an outline of the subject, it answers very well the demands of those who have not time or opportunity to master the larger works on embryology such as Minot's. It is vastly better that the student should master the contents of this little book than that he should have no acquaintance with the subject. No one can master the fundamental truths of pathology without an acquaintance more or less profound with embryology.