"Approximately one-third of the communications given at the Fourth International Congress of Neuropathology have dealt with histochemistry or have identified histochemical techniques." This statement, with corresponding warnings about misuse and misinterpretations of these new techniques, was made by the Chairmen of the Official Themes, Pearse, Shimizu, and Wolman, in the summary of the proceedings at the end of this magnificently presented volume. Indeed, the extraordinarily rapid progress of histochemical and biochemical approaches to the problems concerning the central nervous system made it necessary for the Editorial Committee to limit the length of each communication to 5 to 8 pages and 2 to 3 illustrations. However, this synoptic panorama of new fields in the study of structure and function of the central nervous system gives insight into new perspectives and possibilities for future research.
The volume opens with reproductions of the various opening speeches of the Congress. President Haymaker, in his