Experimental Study of Children

strength of the individual is fundamental to the economy of health." He discusses methods of study, and lays much stress uPon the value of anthropometry as affording a test for systems of. physical culture. The author personally studied 1,074 children in the Washington schools, considering cephalic index, and sensibility to heat and locality in relation to mental ability, sociological condition, sex and puberty; whilst anthropometrical, sociological, and psychological study of nearly 22,000 children was made by their teachers under careful supervision. Lastly, an investigation into abnormal children was carried out. The following are some of the main conclusions arrived at hy the author : Dolichocephaly increases as mental ability decreases; dull and unruly boys seem to have a large percentage of long heads; the children of non-labouring classes are more sensitive to heat and locality on skin than those of labouring classes. From study of the whole mass of children *t appears that as the circumference of head enlarges mental ability increases; that girls are heavier and taller for a certain tune, one or two years, before puberty; that bright boys are in general taller and heavier than dull boys; that a mixture of