174 Trans. Acad. Sci. of St. Louis. 
the material into three groups, rather than to treat it by 
single grades. The result is not materially different in either 
method, but the means of the three large groups are more 
deserving of confidence than the means of the more numer- 
ous grades. 
TABLE NO. 10. 
Distribution of Girls, Aged 12. Girth of Chest at Forced Expiration. 
School es ade. No. of Observations. 
VEN URUG EC ULNENY Wa6 8 ES Edea be CSUN NS URS 6s ce OE see Wes oe eee 13 
i ae Wwe ete Nie be Te Lies swe Ue Weeds «ou cue chbele nee 68 
EE et ee a re ess COP EA bets eee hed eset Se wen ee 204 
A ROCE EN e S is a pee ees tbe e'a6 40004 wee ee esos cad wee 381 
W bee Ue cA whee Dee cA pC SEN URCU CSS bbs ccwies cee tecb sews 210 
IW BR Se oe oe a is ok ea eh we ees a beste deve 111 
Vivo et a he viv iene REC RUE Lek aR ioe rs Oe vs 13 
WEE en eM Oe eR Oe Pe eee ere caon twee 3 
Grade IV, containing the greatest number of girls, is the 
mean grade at this age. With it may be compared the 
mean girth of chest of the 285 girls in grades I, I and 
I{I, and the 337 girls in the higher grades V, VI, VII and 
VIII. The following results appear: 
TABLE NO. 1l. 
The Girth of Chest at Forced Expiration in Dull, Mediocre and Precocious 
Girls, Aged 12. 
No. of Obser- 
School Grade. Mean. vations. 
1, Wie ie 66.21cm 285 
Vols iesds bi eewandnee és: 66.48 381 
V, VI, VII, ‘Wits. 8: Siete. 67.89 337 
TABLE NO. 12. 
The Girth of Chest at Forced Expiration in Boys, ee 10. 
. of Obser- 
School sep Mean. Average. ee 
ides otéu cedusesse vevss seen O8,06-0m. 62.62 115 
a cee 63.11 4 
Briss 63.94 63.81 462 
IV . 64.24 64.32 189 
Vistas pee eRe. ee Oa ee 12 
ws re Selees 3 
Successful pupils have larger chests than the unsuccessful. 
The width of head, or distance from one parietal eminence 
to the oem measured with callipers, is also greater in more 
pupils than in those less advanced. 
