STUDY OF BRAINS OF SIX EMINENT SCIENTISTS AND SCHOLAES. 



223 



twice as much as the average normal male brain. In the case of this overburdened 

 youth, however, there was an abnormal increase of useless tissue with a profound dim- 

 inution in the number of the functional elements. Structural defects of some such 

 kind underlie all similar cases. 



Fig. 7. a. Brain of Helmholtz (after Hansemann). b. Brain of a Papuan (drawn by the author from a specimen 

 in the Anatomical Museum, Columbia University), c. Brain of chimpanzee. 



The fruitful investigations of many anatomists and anthropologists have resulted 

 in the tabulation of thousands of brain-weights drawn from all the social and intel- 

 lectual classes, among which more than one hundred (considered in Table I) are of 

 men of intellectual eminence. Men of the kind who never remain steadily employed 



A. p. S.— XXI. Z. 12, 10, '07. 



