INCREASE OF THE BRAIN IN WEIGHT. 



I I 



increase in the thickness of the scalp and bones, and also 

 for the space between the brain and dura. 



The brain- weight among non-European races has 

 been but little studied, and nothing is to be gained by 

 attempting to combine the more scattered observations 

 that exist. In the United States, however, during the 

 war of the secession there were made by Dr. S. B. 

 Hunt * a series of observations on the brain-weight of 

 negroes and mulattoes as compared with that of native 

 white soldiers. It is probable that in all cases the 

 negro blood in the mulatto was mainly derived from 

 the mother. 



TABLE 2\a. THE WEIGHT OF THE ENCEPHALON IN AFRICAN 

 NEGROES AND IN MULATTOES. (Hunt.} 



The absolute weights are large both for whites and 

 blacks. But it must be recalled that these subjects 



1 Dr. S. B. Hunt, Quart. Journ. PsychoL Med., New York, 1867. 



2 Compiled from observations by Clendenning, Sims, Tiedemann, 

 and Reid. 



