AGE PER GRADE OF TRUANT AND DIFFICULT SCHOOLBOYS. By Walter S.

Cornell, M.D.,

Philadelphia. For the material used in this paper and its tabulation I am indebted to Miss Katherine Calwell, principal of Special School 'No. 2, and Miss Mollie A. Woods, principal of Special School No.

6, Philadelphia. For the kindly cooperative work. AGE

PER

GRADE OF

most

part,

it is the

product

of their

236 BOYS IN SPECIAL DISCIPLINARY CLASSES OF THE SCHOOLS, SHOWING THEIR RETARDATION.

PHILADELPHIA

GRADE.

Age

in Years.

1A

IB

2A

2B

9 10 11 12

7 11 1

13

3A

3B

2 4 10 16

11 5 7 11

9

7

14 15 16

Av. age per half grade

5

5.8

Av. age per

9.4

grade Normal