COMPOSITION OF BRAIN OF ATAXIC PIGEONS 



87 



Relations of sex, body weight, and age to brain weight {table 4) 



When the data concerning the six bird and brain groups of the 

 above tables are subdivided on the basis of sex and arranged in 



TABLE 2 

 Details on the materials used in the preparation of the ataxic (affected) pigeons' 



brains 



1 Very scraggly feathers. 



2 This bird ataxic when younger; practically normal when killed. 



3 Somewhat emaciated. 



order of age, a number of interesting facts are made clear. It 

 may first be noted that in every case the males of a group show a 

 larger average brain weight than that of the females of the group. 



