95 
Mental and physical development of school-children. 
Comparisons with the results of other investigators. 
Owing to the limited amount of investigation on the mental devel¬ 
opment of school-children hut little can be said as to how my mental 
tests agree with other investigations. For the purely physical tests, 
weight, height and lung-capacity, more material presents itself. 
For purposes of comparison with the first two—weight and height— 
I have chosen the results of Bowditch1 2 of Boston and of Peckham’ 
of Milwaukee. The weights of the children in both these investiga- 
Table XIII. 
Comparative weights of Boston, Milwaukee and New Haven school-children. 
Age. B M NHa NHp 
Boys. 
6 
45.17 
44.81 
47.86 
46.8 
7 
49.07 
49.10 
52.08 
51.2 
8 
53.92 
53.81 
56.49 
52.5 
9 
59.23 
59.46 
61.69 
60.0 
10 
65.30 
65.35 
68 31 
68.4 
11 
70.18 
70.92 
75.57 
70.8 
12 
76.92 
76.08 
83.25 
82.3 
13 
84.84 
84.89 
90.95 
88.0 
14 
94.91 
95.76 
97.45 
91.7 
15 
107.10 
109.05 
109.95 
110.0 
16 
121.01 
122.06 
126.03 
127.0 
17 
127.49 
130.35 
126.70 
130.0 
B, weight of Boston school-children in 
pounds. 
M, weight of Milwaukee school-children 
B M NHa NHp 
- Girls.- 
43.23 
43.12 
46.92 
44.3 
47.46 
46 97 
49.65 
50.4 
52.04 
50.87 
53.32 
53.0 
57.07 
56.44 
59.27 
58.8 
62.36 
62.45 
66.09 
62.7 
68.84 
68.84 
72.35 
10.0 
78.31 
77.82 
86.09 
84.5 
88.65 
87.96 
92.97 
92.0 
98.43 
97.64 
97.15 
98.0 
106.08 
105.87 
103.06 
104.0 
112.03 
110.58 
111.41 
113.0 
115.53 
113.32 
118.45 
113.1 
NHa, weight of New Haven school-ehil- 
dren in pounds—arithmetical averages. 
NHp, weight of New Haven school-chil- 
in pounds. 
dren in pounds—median values. 
tions as well as in mine were taken in ordinary clothes. My original 
calculations were made by the method of median values and the 
curves previously given are plotted upon this method. Since the 
results of both Bowditch and Peckham were obtained by arith¬ 
metical averages, for sake of comparison of the two methods, and also 
for comparison of localities, I recalculated my results by arithmetical 
1 Bowditch, Growth of children, VIII. Ann. Bept. State Board Health Mass., 301, 
Boston 1817. 
Bowditch, Growth of children, X. Ann. Bept. State Board Health Mass., 35, Boston 
1879. 
Bowditch, Growth of children studied by Galton's method of percentile grades, 
XXII. Ann. Rept. State Board Health Mass., 479, Boston 1891. 
2 Peckham, Growth of children, VI. Ann. Bept. State Board Health Wisconsin, 28, 
Milwaukee 1881.