Porter — Relation of Growth to Probable Deviation. 239 
The agreement between the series is satisfactory and dem- 
onstrates the stability of the method as well as the accuracy 
with which it has been employed in these particular instances. 
The coincidence is the more significant because the St. Louis 
children are taller than the Freiberg children. 
TABLE No. 2. 
A Comparison of the Average Height Standing of School Children in the Frei- 
berg School District (Geissler and Uhlitzsch) and in the St. Louis Public 
Schools. 
St. Louis Boys. | GIRLS. 
Age at Sia e Sen aaa as FREIBERG 
Bienes: St. Louis. | Freiberg. | St. Louis. | Freiberg. ope 
6 108.94 cm. 108.6 cm. | 107.67 cm. 107.9 cm. | 64to 7 yrs. 
7 114.038. ** 162 113 95 ** 117.0; ** Sag oa » ac 
8 119.13 -* 117.6. 118.36. bMS iy ora) Eee eel 
9 124.35 ** 123.10 123,67 YE Gea e EG: 
10 128.87. ** ¥26.7 8° 128.43 * 126 e110. = 
il 133.84 ¢ 130 +6 183.19 «* 131.0 ll - 1246 
12 138.21. *¢ 186.5...°* 1394) 186.50 *F 12-38 
138 142.91 — 6 140.1 -* 146.53 ** 141.6 ** #8 -— 14 * 
14 148.58 *# 144,1 150.84 <‘ 145.5 ‘** | over 14 
15 154.90 155.04 § 
16 160.27 * Bay Pi) Side 
17 165.19. ** 59.33 ...** 
18 164i" 159.42 
19 158.46 § 
20 159.41. 
21 159.98 ** 
It follows from table No. 1 that The Physiological Differ- 
ence between individual school children and the Physical Type 
of their sex and age is essentially the same, where the differ- 
ences between the children compared are not greater than those 
existing between the St. Louis and the Freiberg children. 
The material now to be discussed is presented in Tables No. 
6, 7 and 8 and consists of the Number of Observations, Aver- 
age, Probable Error of Average, Probable Deviation, Rela- 
tive Annual Increase of Average and Relation of Probable 
Deviation to Average of Weight in indoor clothing, Height 
standing without shoes, Height Sitting, ¢. e., height from the 
crown of the head to the chair on which the child sits erect, 
Span of Arms, or distance between the tips of the middle fingers 
when the arms are extended in a plane with the shoulders, 
and Girth of Chest, obtained by adding the girth of the chest 
