Table 16: Ratio oj weight oj Mammals Ratio 



brain to weight of body in Squirrel monkey (Saimiri 



certain mammals and reptiles sciutea) 1:12 



(after Cobb 1965) 



Tamarin (Leontocebus) 1 : 19 

 Porpoise (Dolphin) (Phucaena 



communis) I : 38 



House mouse (Mus musrulus) I :40 



Tree shrew (Tupaia javanica) I :40 



Man {Homo sapiens) 1 :45 



Ground shrew (Sorex minutus) 1 :. r >() 



Monke) (Macaca mulatto) 1 : 170 



Gorilla (Gorilla gorilla) 1 :200 



Elephant (Elephas indicus) 1 :600 

 Sperm whale (Physeter catodon) 



o.ooo 



Reptiles 



Crocodile 1:5,000 



Stegosaurus 1:30,000 



Brontosaurus 1 : 100.000 



the foramen magnum, man has the highest value, and still ends up on top 

 (Radinsky 1967)! 



All the indices I have cited have a certain though limited usefulness 

 when comparisons are made between one species and another. However, few 

 studies have seriously addressed themselves to this problem within the 

 species of man. 



Matiegka (1902) and Pearl (1905) claimed that in man brain weight 

 varies with body weight and with body height. That is to say, they claimed 

 to find that taller people and heavier people have larger brains. However, 

 more recent workers have questioned the correlation claimed to exist be- 

 tween brain weight and body weight within the human species. 



Pakkenberg and Voigt (1964) have made a more refined analysis on 

 the brains of European subjects. They showed that the increasing brain 

 weight with increasing body weight found by the earlier workers really re- 

 sults from the fact that people with high body weight are usually taller 

 than average. The earlier workers had failed to correct for body height when 

 evaluating the relationship between brain weight and body weight. When 

 this correction was made, it was found that brain weight depends signifi- 

 cantly on body height but not on body weight (Pakkenberg and Voigt 1964, 



P- 3°3)- 



107 l< 



