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HELEN DEAN KING 



ferent conclusion. The lowest brain weight in the infected. group 

 is 1.5915 gms. This weight is exceptionally low for the brain 

 of an adult rat and it is about that found in a healthy rat of 

 50 days of age, as may be seen from table 12. The rat in ques- 

 tion, therefore, was probably a 'runt' and cannot properly be 

 classed with animals of normal size. 



Normal brain weights of albino rats of various ages and derived from data given by 



Donaldson {'08, '09) 



