History.—Simon K., 7 weeks old, was admitted to the Babies' Hospital Jan. 16, 1917; only child, of Russian parentage; family history negative; full term; normal labor; birth weight reported, 6 pounds, 5 ounces. Breast fed to date of admission.
When about 2 weeks old the parents first noticed that the head was enlarging more rapidly than normal. A little later the veins of the scalp began to be very prominent. Both of these symptoms had increased steadily up to date of admission. There had been frequent vomiting and rather loose stools. The child had not thrived, but had apparently been failing in nutrition.
Physical Examination.—On admission, the child was fairly well developed but wasted. Compared with the small body, the head was enormous. The general appearance of the patient was that of a child with a hydrocephalus. Measurements were:
Circumference of head..... 51 cm.
Circumference of chest..... 39