GASSERIAN GANGLION: ALBINO RAT 



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or 130 to 160 grams in body weight. The third phase represents 

 the remainder of our records, and during this phase the diameter 

 of the cell body remains nearly constant, or even diminishes 

 slightly, with both body weight and age. 



TABLE 4 



Average diameters in n of the cells and the nuclei according to the body weight of 

 the rats, based on the full data. Conditions as in table 3 



The end of the first phase corresponds to about twenty days 

 of age or a body weight of about 21.8 grams. This body weight 

 agrees well with the tabular value given by Donaldson ('15). 



The end of the second phase corresponds to about seventy-five 

 to eighty days in age or 130 to 160 grams in body weight. The 

 animals used may therefore be considered as normal in size. 



During the first two phases the nuclei of the ganglion cells 

 change in size in the same sense as the cell bodies to which they 

 belong, but the amount of change is very small. It is to be 



