WEIGHTS OF PARTS: WILD NORWAY 



355 



This is probably an effect of domestication on the Albino. 

 The explanation of the use of this table has been given on page 

 179 in connection with the corresponding table 122 for the Albino. 



2. Growth of parts of the body. For the general conditions under 

 which these observations were made by Jackson and Lowrey 

 ('12), see pp. 181-182. 



TABLE 188 



Giving in grams the values obtained by dividing the body weight by the body length in 

 millimeters. Based on data in table 187 



TABLE 189 



Norway rat Percentage weights of head, trunk and extremities. 

 (Jackson and Lowrey, '12) 



Sexes combined 



"Including gravid uterus, which weighed 13.76 grams. 



Five Norways only were examined, these having been trapped 

 in barns at the University of Missouri. They were probably living 

 on grain. As will be seen by reference to table 189 the smallest 

 of these, a male, weighed 65 grams and was therefore probably 

 about seven weeks old. The percentage relations of the several 

 parts of the body are given in table 189. 



