78 HELEN DEAN KING AND HENKY H. DONALDSON 



For this purpose the observed data are compared with 

 those for the brain, reference table 187, or with those for the 

 other organs of the wild Norway in the tables from Hatai 

 ('14). 3 These latter are partial tables only, but can, never- 

 theless, be used for our present purpose. Such comparisons 

 show how the data for the captive Grays differ from those for 

 the wild strain. 



In the second place, we wish to determine how the data 

 for the captive Grays are related to those of the Albinos. 

 To do this the data in the several reference tables for the 

 Albino are used as standards, and the deviations of the ob- 

 served values similarly determined. 



In the tables giving the data on the organ weights there 

 are entered the percentage deviations of the observed from 

 the standard values on both the body weight and body length, 

 as observed. In the charts, however, the graphs for the 

 deviations based on body lengths are alone given. 



There are no reference tables for the weights of the ol- 

 factory bulbs or of the paraflocculi, and the observations on 

 these parts of the brain have, therefore, been presented from 

 the standpoint of their relation to the observed weight of 

 the entire brain. In the case of the hypophysis, this relation 

 has also been shown. 



ON THE WEIGHT OF THE BEAIN AND OF SOME OF ITS PAETS 



Standard: Data in reference table 187 for the wild gray 

 Norway. In the wild gray Norway the brain is heavier than 

 in the Albino. 



In tables 13 and 14 the weight of the brain in the successive 

 generations is given for each sex and also the percentage 

 deviations from the standard values. No tables are given 

 for the limiting values in each generation, as shown in charts 

 15 and 16. In table 15 are given the weights of the olfactory 

 bulbs and of the paraflocculi and the percentage values of the 



* For convenience, the tables from Hatai ( '14) are cited under the numbers 

 which designate them in The Eat (Donaldson, '24). 



