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Professor Ladd has set himself the task of putting forth the assured or alleged results of Physiological Psychology, keeping in view the belief that there is no ground for extravagant claims or expectations, and still less ground for any fear of consequences, in the way of falling upon something which would prove that perhaps, after all, man is not a spiritual and rational being. The book which he gives us is the first fruit of American work in this field, which covers the whole subject, and with the exception of Wundt (Grundzüge der physiologischen Psychologie), there is no other work at all which even attempts to cover the entire ground. How well the territory has been covered is difficult to show in a short notice of a work on so comprehensive a subject. Throughout the book it is apparent that the author's aim is to get at the truth, or