86 



MATHILDE L. KOCH AND OSCAR RIDDLE 



the present study are given in tables 1 to 3. The weights of the 

 two parts of the brain, the weight of the entire brain, the 

 weight of body, the sex, and the age of the birds of the group 

 are included in the same tables. In these tables the birds are 



TABLE 1 

 Details on the materials used in the preparation of the normal (control) pigeons' 



brains 



all arranged according to decreasing age. These tables are 

 given in order that all of the necessary data may be presented, 

 including the size and composition of each sample as prepared 

 for analysis. These tables are not used directly in the compari- 

 sons made below. 



