To the kindness of Dr. B. Sachs, to whose service at Mt. Sinai Hospital this case was admitted on Oct. 16, 1909, is due the opportunity of making this study. A synopsis only of the history and clinical features is given, as the case will subsequently be presented from the clinical point of view by another hand.
—B. G., male (admission number 111186) ; family history and previous history yield nothing of importance. Venereal infection denied; no drug habits; no acute infection preceding onset.
—About fourteen months before admission patient broke right humerus in the upper third with very slight trauma. Two weeks after this injury he broke the left humerus in the upper third while raising the window. Both fractures healed very quickly. Following these injuries patient noticed that he was growing weak and thin; the muscles of both arms were beginning to atrophy and his