96 



MATHILDE L. KOCH AND OSCAR RIDDLE 



above-stated abnormal relation of phosphatids and sulphatids 

 to age (at 200 to 600 days) disappears. The difference of result 

 on this basis of calculation is directly due to the fact that total 



TABLE 5 



Chemical composition of cerebrum and cerebellum-medulla of normal and ataxic 

 pigeons (in per cent of solids) 



Distribution of sulphur in per cent of total sulphur 



Protein-sulphur. . . . 



Lipoid-sulphur 



Extractive-sulphur , 



Total sulphur (in per cent of solids) 0. 93 



65.3 

 18.1 

 16.6 



69.7 

 16.5 

 13.8 



1.02 



66.6 

 18.9 

 14.5 



0.72 



69.9 

 15.3 

 14.8 



0.76 



55.8 

 26.6 

 17.6 



1.00 



54.5 

 23.5 

 22.0 



0.96 



56.8 

 27.2 

 16.0 



0.87 



49.6 

 32.1 

 18.3 



0.97 



Distribution of phosphorus in per cent of total phosphorus 



Protein-phosphorus. . . . 



Lipoid-phosphorus 



Extractive-phosphorus . 



Total phosphorus (in per cent of 

 solids) 



17.7 

 63.0 

 19.3 



1.39 



20.1 

 59.8 

 20.1 



1.46 



13.9 

 67.5 

 18.6 



1.28 



16.0 

 62 1 

 21.9 



1.26 



18.7 

 61.7 

 19.6 



1.55 



18.0 

 60.2 



21.8 



1.50 



17.9 

 61.2 

 20.9 



1.43 



20.4 

 59.3 

 20.3 



1.51 



phosphorus and total sulphur are reduced in the brains of about 

 600 days. Calculated thus, lipoid-phosphorus is in greater 

 amount in the 598-day normal than in the 205-day normal. 



