Porter — The Physical Basis of Precocity and Duliness. 175 
TABLE NO. 13. 
The Width of Head of Girls, Aged 12. 
No. of Obser- 
School reset Mean. Average. vations. 
Ceres edt er eee EE MINOR a ee eg 1] 
- ides bene Geena sas Sopetaes 144.25mm. 143.68 mm 68 
BUCO e ee Kaien os chee cet aan 45.52 144 193 
EV oon tcc oe ce os Naas Came 145.75 144.94 348 
Ve eter Vere le ae eas leee 146.24 145.50 217 
VER ets ticki nee hee cae 148.98 147.64 89 
Viet ee eae ialdees vee tee) eevee ia ose eee 10 
Vil eee Aaa Seen Ne bis ge ele ew eet. eee eee 4 
TABLE NO. 14. 
The Width of Head of Boys, Aged 10. 
No. of Obser- 
School Grade. Mean. Average. vations. 
Drees Seer es Se Rees 146.06 mm 145.86 mm 92 
ee ree re eer ee 146,38 146.73 408 
EL lbs ve ceae sieve canes bens 146.71 146.48 397 
EV i Mise eee iroge 107 £6 147.21 170 
Note.—The following information may be of interest. The classification 
of pupils is irrespective of nationality. The children were weighed on Fair- 
banks Standard Scales in indoor winter clothing. The shoes were taken off 
when the height standing was measured. The girth of chest was taken over 
the shirt in boys and over the dressin girls, in each case on a level with 
the nipples. The occasional corset was removed. Head measurements 
were made by a nn of the St. Louis Medical College. 
o far as I am aware, the only other investigations into the relation 
badass physical Prather and success in school life are recorded in the 
augural Dissertations of Dr. Gratsianoff and Dr. Sack. Dr. Gratsianoff 
measured the children in Arzamas, a small town in the province of Nijni 
Novgorod. He claims, as I learn from the work of Sack, that successful 
pupils are larger than the unsuccessful and that the rate of growthis quicker 
in the successful. Sack (Phisical Development of the Children in the Middle 
Schools of Moscow. 1892. Russian.) rejects the work of his predecessor, as 
founded “for the most part on a totally insufficient number of observa- 
tions’’ (page 131). Sack’s own results are derived from the examination 
of 4,245 boys, distributed among eight school grades; 2,600 were measured 
swice. Including the latter, the extent of Sack’s material up to age 18 is 
seen in the following extract from his table on page 57: 
Age. No. Observed. Age. No. Observed. 
7-8 ee eS AG Sis ei ic te Gees 990 
Boe eves cs ieee ck peveds cae 18 18-14 ..... VUE EVs ov te ieee SOO 
O-10 wise cies vveeeebesee sss 76 TEAS Cees ees is tcc caek - 744 
POSTE case eee tic 860 ROrIG Soin tees cvisucss beees cus 738 
MA12 cise Sen Souk evens css GF1 et A a ee ree Owner + 833 
No weights have been published. The author confirms Gratsianoff’s 
