Cameron, D. Ewen. Objective and Experimental Psychiatry. New York:  Macmillan Co. $3.00.

Dr. Cameron states in his preface that, “An increasing number of us experience a feeling of growing distrust of purely descriptive and intuitive concepts of human behavior and find it more and more difficult to content ourselves with facts or assertions save where they will withstand experimentation and not fail us in prediction. From their writings it is clear that earlier workers have felt this too, but we are the more fortunate in that time has brought us so great a development of instrumentation and so much larger understanding of experimental methods that we are now in a fair way to realize our dream of analyzing human behavior objectively, dispassionately, and above all of being able to predict and control.” The evolution of any science is traceable through several well-defined stages—an early stage during which it is dependent upon dogmatic statements by gifted leaders, a later observational stage during which phase similarities and differences are sought and classifications are made and during which the refinement of quantitation is introduced, and finally the experimental stage. Psychiatry as a