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Dr. Kretschmer's researches contain a great many interesting and valuable suggestions, even though one may not be willing to accept all his conclusions. Briefly: He has discovered a more or less persistent line of parallel development between the physical characteristics of his mentally diseased patients and the types of mental disturbance which they present. It is not the old idea of the body influencing the general trend of the mind or of the mind stamping the body with certain definite stigmas. Stated in such a way the thesis of his book might seem vague and subjective, while, as a matter of fact, his method of procedure is intensely objective and accurate. The time was when we thought of human beings as divided into two compartments, "mind" and "body," and considered each compartment separately. "Mind" was enclosed in one airtight compartment of the personality, while side by side with it was