To the investigator in chemotherapy, a work such as this is an absolute necessity; to many others it will be a welcome source of information. It is, no doubt, because the study is so young—hardly more than 25 years old—that a complete reference work on chemotherapy has not as yet been available. The ambition of the authors, the one a chemist, the other a physician, to supply this need will be realized, if the present volume, the first part of the series, is to serve as a criterion. It treats the subject with typical German thoroughness. The second part is to include the metal derivatives, and the third will take up general questions. No doubt, all interested will look forward with anticipation to the publication of these other parts.