Since the time of Hippocrates and the development of the ancient Greek cult of eclectics, systems have been the curse of medical progress. The development of all-or-nothing policies as to the cause and cure of disease represent extremes far removed from the open mind and the rationalization that are the marks of true science. Such policies are, however, not to be confused with the development of a point of view. Frequently the ability to consider a problem from a new aspect leads to increased knowledge and opens the way for productive research. A recent conspicuous example is the discovery of insulin, followed rapidly by parathyrin, and the finding of the toxin of the streptococcus of scarlet fever, followed promptly by the discovery of similar toxins associated with streptococci in erysipelas and in puerperal infections.
The German clinician Krehl views with interest the present state of medical practice and is inclined