384 



CAPTIVITY AND DOMESTICATION 



diminution in the percentage of water in these parts. Such 

 would come about if the cytoplasmic (protein) portion of the 

 neurons was most altered, and comparison of the size of the cell 

 bodies of the neurons hi the central nervous system shows them to 

 be smaller in the Albino than in the Norway, while the number of 

 neurons, so far as tested, is the same in both forms. 



TABLE 212 



Giving the difference in the weights of the brain and spinal cord for the wild Norway 

 as compared with the domesticated Albino rat at a series of selected body weights 



In the case of the cells of the superior cervical sympathetic 

 ganglion however the cells in the Norway are slightly smaller and 

 show a smaller nucleus-plasma ratio. 



(b) Characters in which the caged and domesticated Norways 

 differ from the domesticated Albino. In this presentation it is to 



