The opportunity of recording the history of this patient I owe to the courtesy of Dr. Lucian D. Clark of Toledo, Ohio, who brought her to me for examination December 7, 1907.
—The patient, F. B., was a girl of 17. There had been no other case o[ill] myositis ossificans in the family. Both parents were of American birth, living and in good health; no lues, no tuberculosis; two other children were living and in good health, neither of them presenting any developmental anomalies. Birth of patient was non-instrumental and labor was neither prolonged nor difficult. She was breast-fed and did not suffer from any infantile diseases nor exanthemata. At the age of 1 year it was first noticed that the thumbs and great toes were malformed. The mother stated that shortly after the patient entered her second year lumps (nodes) were observed to form on the head. They