SEVEN FIGURES During the last ten years our interest in studies concerning the sympathetic system has increased progressively, as clinical applications of the knowledge gradually acquired have become manifest. Consequently, there is an increasing number of investigators who carefully attempt to clarify the numerous problems of anatomy, physiology, and physiopathology which, up to the present time, are still under discussion in this intricate field, Anatomists occupy themselves especially with

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... o subjects of paramount importance. These are: the connections of the sympathetic system and the origin and course of its afferent path. On the other hand, studies of the morphology of the sympathetic ganglion cells have decreased, since the description given by Cajal (1) by the aid of his silver method. Serious contributions to this subject have, however, appeared, of which I may be permitted to recall those of my pupil, Riquier (2), on the morphology of the cells of the ganglion oticum and the junction between spinal and sympathetic ganglia of the turtle. In order to examine as closely as possible the two problems mentioned, anatomists, who follow to-day a procedure more and more biological, have been less inclined to employ direct observation of pictures which we are able to secure with present methods of staining normal nervous tissues than physiological experimentation and study of the changes produced by injuries to some portion of the sympathetic itself or other nervous structures which are supposed to be in relation with it.