138 Proceedings of the Royal Society of Edinburgh. [Sess. 
sexually active individuals who are the subjects of a favourable environ- 
ment. In other words, members of the well-conditioned, prosperous classes 
of society should possess a more rapid rate and a more prolonged period 
of growth than the unfavourably situated, badly nourished classes. And 
further, the definitive body forms of the two classes should be different. 
That the children of the well-to-do grow more than the children of the poor, 
and that they are taller at corresponding ages, is shown by the figures in 
Tables XLI. and XLII. 
Table XLII. — Height and Growth-rate of the Children of Prosperous 
Middle-class Parents (33). 
Ho. of 
Observations. 
Age. 
He: 
Feet. 
ight. 
Inches. 
Increase, 
Inches. 
8 
2 
2 
10-6 
9 
3 
3 
23 
4-7 
7 
4 
3 
4-8 
2-5 
12 
5 
3 
6-9 
2T 
14 
6 
3 
8-2 
1-3 
6 
7 
3 
11-3 
3T 
6 
8 
4 
1 
1*5 
2-2 
These measurements show that the Industrial School children, who are 
exposed to unfavourable, but not to the most unfavourable conditions of 
environment, increase in stature in six years from 2 feet 7*95 inches to 
3 feet 8 - 68 inches, or 39 '8 per cent. ; whereas the children with a favourable 
environment increase in the same time from a greater height, viz. 2 feet 
106 inches to 4 feet P95 inches, or 43 per cent, of their original stature. 
They therefore grow not only more quickly, but also both absolutely and 
relatively more. From this evidence the hypothesis gains support. It 
remains to be shown that the definitive body form of tall normal individuals 
is different from that of short normal individuals. This has been done by 
Papillault (34) and Manouvrier (35). 
These observers’ interesting results may be summarised as follows : — 
1. The lower limb and the pelvic girdle show the most marked increase 
in tall men. 
2. The upper limb also increases markedly, the increase being greater 
in the forearm than in the arm. 
3. The foot grows less rapidly than the lower limb as a whole. 
4. The hand does not increase very markedly. 
