A volume of one hundred five pages, presenting the arguments pro and con on the Recapitulation or Culture Epoch Theory. If, as the author thinks, the biological interest so far as it relates to the systematic study of childhood "has somewhat abated," this interest would not have decreased had teachers been given the opportunity in such study, furnished by this delightful volume. The introduction is an admirably phrased statement of the problem together with the difficulties in the way of its solution. A genuine service has been rendered by excellent presentation of the excerpts from writings of the leading biologists relative to the facts which are presumed to be at the base of the theory. In addition to the scientific value of the author's work in this direction, he has presented the facts in such form, and with such continuity and with such happiness, that an extremely readable story has been evolved. The chapter on Human Infancy is of great value. The generalizations of John Fiske on the subject have been carefully analyzed and tested, together with the writings of later and more critical authorities, in such a way as to be of very great assistance to anyone wishing to know the thought of the best thinkers on this topic. Dr. Davidson's conclusions are modestly and excellently stated. -Educational Review, Volume 49 [1915]