310 Trans. Acad. Sci. of St. Louis. 
TABLE No. 16.* 
THE WEIGHTS OF BOYS WHOSE PARENTS WERE BORN IN GERMANY COM- 
PARED WITH THE WEIGHTS OF BOYS WHOSE PARENTS WERE BORN IN 
THE UNITED STATES.f 
GERMAN. AMERICAN. 
Age at | Number of wens, ruse Number of |} Age at 
Nearest Observa- (Kil te iit. : Observa- | Nearest 
Birthday. ions. grammes) | grammes) Birthday. 
6 158 20.04 19.66 263 6 
7 334 21.93 21.67 756 7 
8 426 23.98 23.91 907 8 
9 369 26.64 26.08 878 9 
10 370 28.51 28.49 847 10 
1l 358 31.21 31.26 663 5B 
1 385 33.51 33.45 549 1 
13 321 85.92 85.96 437 18 
14 166 39.59 40.34 352 14 
15 106 44.68 47.25 219 15 
16 52.22 52.10 16 
55.14 40 g he f 
The difference in weight is seen to be of no great impor- 
tance. 
In the absence of special investigations of the influence of — 
social condition and the nationality of parents on the growth 
of children, it is impossible to estimate accurately to what 
degree middle values, calculated without regard to social con- 
dition and nationality, are affected by these factors. The 
data presented in this chapter go to show that the middle 
values of St. Louis children are little influenced by consider- 
able differences in social condition before the period of 
prepubertal acceleration and are not very largely influenced 
by such differences during this period. Further, these values 
are at no time much affected by differences in nationality of 
parents not greater than those existing between Germans and 
Americans. But the whole question evidently requires ex- 
tended study of data difficult or impossible of collection by 
private hands. 
* The birth-place of the boys themselves is not considered in this table. 
+ A few were born in Canada. 
