212 



GROWTH IN WATER AND SOLIDS 



TABLE 



Showing the percentage of water in the brain and spinal cord of the Norway rat at 

 different ages (sexes combined), (Donaldson and Hatai, '11) 



is to be noted that for the most part the rats grew poorly, as 

 shown by the body weights. (Donaldson and Hatai, '11.) 



For Norways trapped in Philadelphia and killed shortly after 

 capture, we obtain, according to body weight, sexes combined, 

 the percentage values of water in brain and spinal cord which 

 are given in table 89. 



A comparison of the values for the Norways and Albinos shows 

 that the percentage of water in the Norways tends to run above 

 that in the Albinos — being +0.37 per cent for the brain and -f- 

 0.73 per cent for the spinal cord. 



