241 

 TABLE I 



the exponent holding from species to species, as it expresses the 

 relative individual growth of the brain to the adnlt state. 



In consequence of this difference in the fixed relations of the 

 weights of the brain and the bodjs between homoneuric species 

 on one side, individuals of a species on the other side, i.e. the 

 difference between the phylogenetic and the ontogenetic exponent, 

 small individuals have comparativelj' more, large individuals compa- 

 ratively less brain than species of corresponding mean body weight. 



This appears graphically in Figures 2 and 3. The difference can 

 become very great in dwarfs and giants of one species; it is very 

 striking in the Figuies 5 and 6, which give the accurate outlines, in 

 natural size, of the skull of a medium sized fennec (Canis zerda), I he 

 smallest species of the genus Canis, and one of the smallest 

 individuals of the species Domestic Dog, of a diminutive breed, 



