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This is the first volume of a massive three volume, comprehensive treatise on which these authors have been working for more than a decade. Their attitude is that comparative psychology is a biologic science rather than a form of philosophy and they have tried to keep their whole study on a basis of experimental procedures rather than speculation. On the completion of the series it will be found that the subject of comparative psychology has been comprehensively covered and that it has been done in a systematic way, closely allied to the method of the zoologists, in that the traits and psychologic characteristics of the various biologic groups are considered, with the evolutionary tree being kept strongly in mind. The present volume is largely one dealing with the technics used today in studying comparative psychology. There is a chapter giving the historical development of the science of comparative psychology in
Comparative Psychology: A Comprehensive Treatise. Volume I: Principles and Methods. JAMA. 1936;106(5):408. doi:10.1001/jama.1936.02770050064028