In December, 1914, at the suggestion of Dr. J. P. Sedgwick, who offered his material in the University Hospital (Minnesota), the writer began making measurements of new-born infants. This work was pursued until May, 1917, and in all, 250 infants, 125 of each sex, were measured. No attempt was made to measure all the infants admitted to the service, nor was there any attempt at selection, provided they were normal and born at term. Eighty-one per cent. of the babies were measured on the fourth, fifth and sixth day of life, none earlier than the second, and none later than the tenth, the purpose being to allow time for birth traumas to subside and to forestall changes due to extra-uterine growth. The measurements taken were:
1. The total length from vertex to sole.
2. The head and neck height — the distance from the plane of the vertex to that