Mental and physical development of school-children. 97 
in graphic form in charts XXY and XXYI. As no relation 
between the arithmetical averages and median values was considered 
above, I have inserted here the curve of median values, as well as that 
of arithmetical averages. Ages are at the bottom ; the figures to the 
left indicate height in inches ; those to the right indicate weight in 
pounds. 
The height of the children in my tests was taken with shoes ; those 
of Bowditch and Peckham were taken without shoes. After sub¬ 
tracting the height of an average heel of a shoe, which is about 1 
inch, the New Haven children are still taller than those of Boston 
and Milwaukee. The results for height are recorded in table XIV 
and charts XXV and XXVI. 
Table XIY. 
Comparative heights of Boston, Milwaukee and New Haven school-children. 
Âge. 
B 
M 
NHa 
NHp 
73 ( 
6 
43.75 
44.08 
45.2 
45.0 
7 
45.74 
46.09 
47.4 
47.1 
8 
47 76 
48.05 
49.0 
48.9 
9 
49.69 
50.00 
51.3 
51.2 
10 
51.68 
51.85 
53.0 
53.0 
11 
53.33 
53.76 
56.7 
55.9 
12 
55.11 
54,98 
57.2 
57.0 
13 
57.21 
57.47 
59.2 
58.8 
14 
59.98 
59.89 
60.4 
59.3 
15 
62.30 
62.34 
63.1 
62.8 
16 
66.00 
65.07 
66.7 
63.7 
17 
66.16 
66.60 
67.1 
66.1 
B, height of Boston school-children in 
inches. 
M, height of Milwaukee school-children in 
inches. 
B M NHa NHp 
- Girls.- 
43.35 
43.78 
45.0 
44.9 
45.52 
45.93 
46.9 
46.9 
47.58 
47.59 
48.8 
48.4 
49.37 
49.81 
61.1 
50.8 
51.34 
51.89 
53.2 
52.8 
53.42 
53.80 
54.1 
54.6 
55.88 
56.47 
58.3 
57.9 
58.16 
58 68 
59.6 
60.4 
69.94 
60.50 
60.7 
61.4 
61.10 
61.69 
62.2 
62.5 
61.59 
62.16 
62.8 
62.5 
61.92 
62.91 
63.8 
63.6 
NHa, height of New Haven school-chil¬ 
dren in inches—arithmetical averages. 
NHp, height of New Haven school-chil¬ 
dren in inches—median values. 
This difference in weight and height is very likely due to the 
smaller proportion of foreigners included in my results. American- 
born children are taller and heavier than foreign-born children.1 
So far as the relation of growth of different ages is concerned, the 
same general laws appear in my results as those obtained by Bow- 
ditch and Peckham. 1 
It is interesting to notice the effect of the private-school gymnasium 
upon the development of lung-capacity. Table XY and chart XXVII 
1 Bowditch, Growth of children, VIII. Ann. Kept. State Board Health Mass., 307, 
Boston 1817. 
7