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The title and introduction to this book seem to indicate a duality of subjects: the one concerns pharmacology as a branch of biologic science, the other, as a method for the treatment of disease. Pharmacology is defined as the study of changes induced in living organisms by the administration in a state of minute division of such unorganized substances as do not act merely as foods; it is further stipulated that the drug must be introduced from without. The position of pharmacology in biologic science is described as follows: "Thus as physiology is the study of the life of the normal organism, pharmacology is the study of the organism rendered abnormal by drugs, while in pathology the phenomena of life under disease are examined." It is also stated that all three subjects may be pursued without reference to the practical needs of medicine. These delineations, in their present form, are