This is a companion volume to Ehrlich and Hata's "Chemotherapy." In it Wechselmann considers salvarsan very fully from the clinical standpoint. His personal experience in over 1,400 cases, the clinical experience of various other experimenters, the technic of administration, repetition of the dose, effects on the Wassermann reaction, by-effects and accidents—most of the aspects of the subject, in short, are elaborately set forth. The volume is a valuable statement of the earlier experience with this new and startling remedy, although, of course, the statement is already old, so fast does the subject travel these days. As an ending of the volume there are appropriately given a group of sixteen fine colored illustrations, showing the effects of salvarsan on various syphilides. These illustrations are perfect, and show well the effects of salvarsan on syphilis, although no better or more rapid results are shown than are usual from mercury in similar