326 Memorias de la Sociedad Científica 
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but in colored children the girls slightly excel the boys in cir- 
cumference of head. 
4. Colored girls have larger circumference of head at all ages 
than white girls. 
5. An important fact already discovered by others is that 
for a certain period of time before and after puberty, girls are 
taller and heavier than boys, but at no other time. 
6. White children not only have a greater standing height 
than colored children, but their sitting height is still greater; 
yet colored children have a greater weight than white chil- 
dren—thatis, white children, relatively to their height, are longer 
bodied than colored children. 
7. Bright boys are in general taller and heavier than dull 
boys. This confirms the results of Porter. 
8. While the bright colored boys excel the dull colored boys 
in height, the dull excel the bright in sitting height. This seems 
to indicate a relation or concomitaney of dullness and longbo- 
diedness for colored boys. 
9. The pubertal period of superiority of girls in height, sit- 
ting height and weight is nearly a year longer in the laboring 
classes than in the nonlaboring classes. 
10. Children of the nonlaboring classes have, in general, 
greater height, sitting height, and weight than children of the 
- laboring classes. This confirms the results of investigations by 
Roberts, Baxter, and Bowditch. 
11 Girls are superior to boys in their studies (but see con- 
clusion 14). : 
12. Children of the nonlaboring classes show greater ability 
in their studies than children of the laboring classes. This con- 
firms the results of others. 
13. Mixing of nationality seems to be unfavorable to the 
development of mental ability. 
14. Girls show higher percentages of average ability in their 
studies than boys, and therefore less variability. This is inter- 
