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Statures of Toronto girls, grouped in one-year periods.

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Statures of Toronto girls, grouped in one-year periods-Concluded.

Height in centimeters.

150.

151

152

153

154.

155.

156

157

158

159

160

161

162

163.

164.

165.

166.

167

168

169.

170.

171

172.

173.

174.

Cases.

Average age

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88 363 597 759 834 875 822 876 824 665 443 247 123 6.508 7.508 8.475 9.475 10.483 11.475 12.458 13.458 14.442 15.433 16.358 Average height.... 100.4 105.2 110.4 116.0 120.6 125.2 130.8 136.0 141.7 147.7 153.0 155.8 156.5 Mean variation ±4.26 ±4.80±4.80 +5.30 ±5.53 ±5.32 ±6.20±6.52 ±6.96 ±7.17 ±6.35 ±5.86±5.35 Corrected average. 110.4 116.0 120.7 125.3 130.9 136.1 141.9 148.0 153.3 156.0 156.7

The following table exhibits the statures of Toronto children as compared with American children in general:

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10.5. 11.5. 12.5. 13.5. 14.5. 15.5. 16.5. Toronto 106.2 111.1 116.8 121.8 126.7 131.5 135.9 140.1 145.4 151.5 157.6 American 105.9 111.6 116.8 122.0 126.9 131.8 136.2 140.7 146.0 152.4 159.7

...

STATURES OF GIRLS, IN CENTIMETERS.

Toronto 105.2 110.4 116.0 120.7 125.3 130.9 136.1 141.9 148.0 153.3 156.0 156.7 American .... 104.9 110.1 116.1 121.2 126.1 131.3 136.6 142.5 148.7 153.5 156.5 158.0

VARIABILITY OF BOYS' STATURES.

Toronto... ±5.12 ±4.82 ±5.08 ±5.58 ±5.59 ±6.15 ±6.15 ±6.80 ±7.79 ±8.55 ±9.00 American.... ±4.80 ±4.92 ±5.22 ±5.53 ±5.66 ±5.90 ±6.32±6.80 ±7.71 ±8.66 ±8.87 ±7.75

VARIABILITY OF GIRLS' STATURES.

Toronto .. 4.80 4.80 ±5.30 ±5.53 ±5.32 ±6.20 +6.52 ±6.96 ±7.17 ±6.35 ±5.86 ±5.35 American ..±4.64±5.07 ±5.25 ±5.58 ±5.73±6.18 ±6.83 ±7.57 ±7.37 ±6.69 ±5.96 ±5.79

It appears from these tables that on the whole the Toronto children are not as favorably developed as are American children, their statures being slightly shorter. The variability of the Toronto series does not differ so much from the general series as might be expected. The causes that modify the growth of children in a single city appear to be so great that the decrease in general variability is very slight indeed.

The variabilities given in the preceding tables are those for the whole year. When the variabilities for each year are calculated from the averages of the trimonthly periods given on pages 1558-1564, a considerable reduction in the values takes place.

Variability for

5.5. 6.5. 7.5. 8.5. 9.5.

BOYS.

Age in years.

10.5. 11.5. 12.5. 13.5. 14.5. 15.5. 16.5.

The whole
year
+5.12 ±4.82 ±5.08 ±5.58 ±5.59 ±6.15 ±6.15±6.80 ±7.79±8.55 ±9.00
Quarterly
periods...+4.70 ±4.65 ±4.77 ±5.38 ±5.35 ±6.02 ±6.08 ±6.61 ±7.63 ±8.22 a±8.91

GIRLS.

The whole year Quarterly

±4.80 +4.80 ±5.30 ±5.53 ±5.32 ±6.20 ±6.52 ±6.96 ±7.17 ±6.35 ±5.86 ±5.35 periods ±4.62 ±4.73 ±5.21 ±5.34 ±5.18 ±5.89 ±6.38 ±6.90 +6.85 ±6.13 ±5.73 ±5.63

a Six-monthly period.

THE GROWTH OF FIRST-BORN CHILDREN.

I have shown (Science, 1895, April 12) that the first-born children in Oakland, Cal., exceed in height later-born children. The data which were then available gave the following results. The columns headed "Differences" contain the amount to be added to the average statures and weights in order to obtain the measurements of first-born and later-born children. The figures in parentheses designate the number of individuals measured.

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+1.12

+0.48

-1.71

ences

-0.72

-0.12

The following tables contain the detailed results of the measurements obtained in Toronto:

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Average stature.. 104.8

101.4

100.5

6.2 101.2

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