CAUCASIAN 
NEGRO 
MULATTO 
Boo 
CHART VIII.—Relation of the area of the genu (ordinates) to brain weight (abscisse). 
The heavy black lines include the majority of the Negro symbols, and exclude the 
majority of the Caucasian. Cf. Chart V. With equal increments of brain weight there 
is a proportionate increase in area of the genu. 
