University of Virginia Library

AN OUTLINE OF PSYCHOBIOLOGY. By Knight Dunlap, Associate Professor of Psychology in the Johns Hopkins University. Baltimore, The Johns Hopkins Press, 1914. PP. 121, octavo; illustrated.

This volume even though brief will be highly appreciated by very many students of normal and of abnormal psychology because it is the first book to afford them just what, in an elementary way, they need concerning the nervous system, the essential musculatures, and the epithelia, whose manifold activities are in some certain mode concomitant to the succession of compound mental events. Surely, and widely, those who a few years ago "came to scoff" at the ever-rising scientific stream of mind-protoplasm relationship will "remain to pray" to the rising and satisfying goddess of the new philosophy. The body with its unimagined intricacies and beauties of still unguessed adaptation and its marvels of Someone's ingenuity is surely now at length coming into its own. And

when, after the years, it has come into its own in a reasonable measure, "the continuity of mind-and-energy" and "the dynamic-spiritualism of the Cosmos" when they are mentioned will no longer draw that quasi-withering smile of toleration to the face of the orthodox psychologist with which some of us are familiar.

This volume, happily devised by Professor Dunlap to meet this real need, at first in his own pupils and later in a wider public, will materially help this progress, for it has within it in fairly up-to-date and simple form much of the structure and function, always of surpassing interest when understood, of the human action-system. Seventy-seven excellently clear and well-chosen illustrations make the well-printed text still more informing. There is a good index; and short lists of books at the ends of the chapters.

The present reviewer notes only one omission of substantial importance from the neurologic part of the book, and that is the very recent, howbeit important, matter of the functional opposition between the sympathetic proper and the other, the cranio-sacral, portion of "the autonomic." The work lacks also, in this first edition, a statement and discussion of the important all-or-none principle which is now applicable to voluntary muscle, probably, and to the neurones. And it is to be hoped too that the author will take the bull by the horns and, in the next edition, show the nature of protoplasm in general in an homologous way, as the basis, through its uniquely complex kineticism, of the onward rush of the mental process. With this addition the essential nature of irritability too might be set forth in this already valuable (and inexpensive) treatise.

GEORGE V. N. DEARBORN.
Sargent Normal School.