NERVOUS SYSTEM: WILD NORWAY 



359 



It may be noted in passing that the same comparison of the data 

 between the birth and the end of the suckling period (i.e., 25 

 grams or 100 mm.) shows an even greater excess in favor of the 

 Norway. 



Chart 64 Norway rat, giving brain weight on the body weight. Males only. 

 With corresponding graph for the Albino inserted for comparison. Formula 

 58, table 187. Also the spinal cord weight on the body weight. Males only. With 

 the corresponding graph for the Albino inserted for comparison. Formula 60, 

 table 187. 



TABLE 192 



Giving the percentages by which the brain weight of the Norway rat exceeds that of the 

 Albino for the like body weight or body length 



