Aside from papers devoted to the function of the myoneural junction there is no other consideration of the effector organ. Thus the contractile process, a significant portion of the reflex arc, is ignored. As a compensation, Barnes and Kircher present concise, lucid introductions preceding each set of articles; these prefaces indicate what specific problems were solved by the ensuing papers, and thereby provide the book with vivacit,y not usually associated with anthologies. All of the research papers in this collection are germane to the comprehension of modern neurophysiology despite the fact that none of them are hot off the scientific griddle. Hodgkin, Katz, and Lloyd, luminaries in modern neurophysiology, account for over half of the contributions. These scientific works, representing some of the best research efforts in physiology, would not be especially meaningful to anyone without some preliminary background in the subject. Thus the book would have little practical value for the undergraduate or the medical student except as-a reference source. On the other hand, the book would serve as an ideal and unique basis for a graduate or seminar course. In particular, the collection of papers should make excellent reading for advanced biomedical engineering students who would be in a position to appreciate the transducer and servo mechanisms associated with the simplest of reflex arcs.