308 Trans. Acad. Sci. of St. Louis. 
The ratio between the two is more easily grasped when the 
difference between the classes at each age and grade is stated, 
black type being used where the professional and merchant 
class exceed the tradesmen’s daughters and lower case type 
where the contrary is true. 
= Kinder- 
Age. parte. I II Ill IV V Vi; | Vital VIE 
6 3.9% 3.9% % % % % % %o % 
3 6.1 6.8 0.7 ae 
8 15.9 15.2 OG cain Fakta fo oie a be cuwan pene eee 
aR Ta ae 13.7 2.3 7.4 2 
oe oe 4.0 13.0 1.1 15.0! 0.7 | O.B |-.---e}ecceee 
Bee bisace 1.6 3.5 172 17.0| 3.6 | O.1 |-----e]eceees 
12 [rece voce 0.3 3.9 5.7 3.0| 6.9 | 3.2 | 0.6 |------ 
13 0.8 8.1 6.4) 6:4 | 42 2.74 °S 
ae eee re : 5 | 9.1| 7.4 3.4 | 4.4 /11.2 
15 it €s GE BT 3.5 1.5 | 11.8 
Rgds eek es tuclecks cacelco ce ace’ ES) 663! 2.9 1 G. 4.0 
The number of boys withdrawn from school to earn money 
is of course greater than the number of girls withdrawn. 
Thus of 562 boys, aged 6, 17.8 per cent. were sons of pro- 
fessional men or merchants and 42.9 per cent. sons of manual 
tradesmen, while at age 14, 29.3 per cent. of 498 boys were 
from the former class and 37 per cent. from the latter. 
ae a ‘ ae . Pro- Sons of —- 
Tes ra fessional Men Mauual thers. 
Birthday, | Mdividuals. | 214 Merchants.| Tradesmen. 
6 562 | 17.8% 42.9% 39.3% 
14 498 29.3 37.0 33.7 
The nationality of the children should be considered in an 
anthropometrical inquiry. It is well known that children of 
the same age but different nationality exhibit differences in 
physical development. The annual report of the Superinten- 
dent of Public Schools, issued Aug. 1, 1891, contains in Table 
V, appendix, page XLVI, a statement ‘‘ Showing the Birth- 
place of Pupils Registered in Each School for the Year 
1890-91,’’ from which the number of pupils in the schools in 
which the measurements were made has been taken and the 
following percentages calculated: — 
