In order to give clearer and more adequate exposition of the present investigation, it is desirable to preface the presentation with a few remarks on general physiology and general pharmacology. Although biology embraces the study of all living organisms and living processes, both of animals and of plants, we medical men have been confining our attention almost exclusively to animals. Our physiology as taught in medical schools and as practiced by medical researchers is for the most part zoophysiology, or animal physiology; and the pharmacology taught in our medical colleges and to which our pharmacologic investigators devote their attention is almost exclusively zoopharmacology, or animal pharmacology. There is, however, a very important department of physiology recognized as phytophysiology, or plant physiology, laboratories for which have been established in many universities. It is surprising, therefore, that in the field of pharmacology, experimental medicine and more particularly experimental therapeutics so little attention