n Antonio Alzate" ' 327 
preted by some to be a defect from an evolutionary point of 
view, 0ut see conclusion 11 
15. As age increases brightness decreases in most studies, 
but dullness increases except in drawing, manual labor, and 
penmanship; that is, in the more mechanical studies. 
16. In colored children brightness increases with age, the 
reverse of what is true in white children. 
CONCLUSIONS AS TO CHILDREN WITH ABNORMALITIES. 
17. Boys of the nonlaboring classes show a much higher 
percentage of sickliness tha boys of the laboring classes. 
18. Defects of speech are much more frequent in boys than 
in girls. : 
19. Boys show a much greater percentage of unruliness and 
laziness than girls. 
20. The dull boys have the highest per cent of unruliness. 
21, Abnormalities in children are most frequent at dentition 
and puberty. 
22. Children with abnormalities are inferior ín height, sit- 
ting height, height, and circumference of head to children in 
general. 
A SPECIAL STUDY OF 1,074 SCHOOL CHILDREN CONSIDERING 
CEPHALIC INDEX AND SENSIBILITY TO HEAT, AND LOCALITY 
ON THE SKIN, WITH RELATION TO MENTAL ABILITY, SOCIO- 
LOGICAL CONDITION, SEX, AND PUBERIY. 
All the measurements of this part of the investigation were 
made by the writer. There were in all more than 1,000 pupils 
specially studied, 526 boys and 548 girls. 
The representative or typical schools were visited, and a 
