Lectures on Conditioned Reflexes. Twenty-Five Years of Objective Study of the Higher Nervous Activity (Behaviour) of Animals.

About a year ago (Jan. 28, 1928), Pavlov's "Conditioned Reflexes," translated by Anrep, was reviewed in these pages. The present volume covers the same subject. It comprises the author's lectures read before various learned societies of Russia and other foreign countries as well as articles as they appeared in various journals from 1903 to 1928. The emphasis is naturally placed on the contributions of his collaborators in the development of this new field of experimental physiology. Except for one addition, the bibliography at the end of this volume is identical in the two books. A delightful illustrated biography of the author prefaces the present volume. The older physician, unfamiliar with the term, should know that conditioned reflexes are acquired reflexes, distinct from the unconditioned reflexes, which are inborn. Conditioned reflexes are therefore distinctly related to behaviorism, social practices, and the nature of cerebral activity in health and disease (neuroses and