The beneficent help that experimentation on animals has given to practical medicine in the past continues to be manifested in the current history of medical progress. If our citizens in scientific centers are to be encouraged, as was urged in a recent issue of The Journal,1 to support the efforts of investigators to secure vagrant animals that may be devoted to the endeavor to lessen disease and prolong life, it will be advisable to keep some of the striking benefits clearly before physicians. In truth, scarcely a week goes by without registering in the domains of the experimental sciences some important finding through biologic methods that is likely to attain application in diagnosis or therapy. An instance of immediate significance has just been recorded by Warren and Whipple.2 It is concerned with some of the unsuspected dangers of the roentgen ray.
Radiant energy of the type represented by