The principal, older, well-established facts of physiology, especially physical, are concisely and clearly stated in Professor Hall's book, but we are surprised to find that practically no mention is made of recent work concerning the rôle of physico-chemical factors in fundamental physiologic processes. Whatever the reason may be, this omission weakens the value of the book, because it fails to give the student any adequate indication of the direction in which physiology is growing at present. The newer knowledge of the normal protective powers of the blood against infection, of its solvent action on alien corpuscles, and other normal properties of this kind are not considered. Throughout the book great stress is placed on morphologic considerations. The chapter on reproduction, for example, is principally descriptive in its character; it might answer very well for a book on embryology, but the underlying causes of the various phenomena described, or the present