[Footnote 45: 1. _Human Physiology, Statical and Dynamical; or, Conditions and Course of the Life of Man_. By J. W. Draper, M.D., LL.D., Professor of Chemistry and Physiology in the University of New York. New York: Harper & Brothers. 1856. 8vo, pp. 649. 2. _History of the Intellectual Development of Europe_. By the same. Fifth edition. 1867. 8vo, pp. 628 3. _Thoughts on the Civil Policy of America_. By the same. Third edition. 1867. 8vo, pp. 323. 4. _History of the American Civil War_. By the same. In three volumes. Vol. I. 1867. 8vo, pp. 567.] Professor Draper's works have had, and are having, a very rapid sale, and are evidently very highly esteemed by that class of readers who take an interest, without being very profoundly versed, in the grave subjects which he treats. He is, we believe, a good chemist and a respectable physiologist. His work on Human Physiology, we have been assured by those whose judgment in such matters we prefer to our own, is a work of real merit, and was, when first published, up to the level of the science to which it is devoted. We read it with care on its first appearance, and the impression it left on our mind was, that the author yields too much to the theory of chemical action in physiology, and does not remember that man is the union of soul and body, and that the soul modifies, even in the body, the action of the natural laws; or rather, that the physiological laws of brute matter, or even of animals, cannot be applied to man without many important reserves. The Professor, indeed, recognizes, or says he recognizes, in man a rational soul, or an immaterial principle; but the recognition seems to be only a verbal concession, made to the prejudices of those who have some lingering belief in Christianity, for we find no use for it in his physiology. All the physiological phenomena he dwells on he explains without it, that is, as far as he explains them at all. Whatever his personal belief may be, his doctrine is as purely materialistic as is Mr. Herbert Spencer's, which explains all the phenomena of life by the mechanical, chemical, and electrical changes and combinations of matter.