This study is only a chapter in a larger setting forth of the entire syndrome, parts of which have already been presented; others are in course of appearance, and still others will be offered later. As many others have done, I1have sketched the development of this situation in its general outlines. Closer attention to the more specific syndrome of the present title followed, as I had had the privilege of attending the second Neurological Congress in Paris, in 1921, and had seen the patients of Marie and Lévy, of Souques and others, and had heard the discussion led by Souques2on the various phases of the parkinsonian syndrome. The same year, at the meeting of the Deutsche Gesellschaft für Nervenaerzte,3in Braunschweig, the same subject was taken up, chiefly by Pollack and Bostroem; further, numerous patients were personally studied in many of the European clinics. A