History.—Almost immediately after it was born, baby B. was admitted to the Touro Infirmary from the Child Welfare Association because of malformations and because of difficulty in resuscitation, cyanosis and short and irregular respiration.
The family history showed that three of the grandparents were still living at the ages of 55, 58 and 60, respectively. The paternal grandmother had died of heart trouble at the age of 51. The members of both sides of the family were long-lived. There were no abnormalities in the parents nor in any other member of the family so far as was known. There was no history of hereditary disease, and there was no consanguinity. The father was 37 and the mother was 28 years old. There were two other children in the immediate family, both healthy; the eldest was 8 years of age and the youngest 3 years. One child had died at