.COMPOSITION OF BRAIN OF ATAXIC PIGEONS 



101 



present in slightly greater amounts in the cerebellum-medulla 

 than in the cerebrum. 



The distribution of sulphur and phosphorus, calculated for 

 the entire brain of the four bird groups considered above, is shown 

 in table 7. These figures are of course based upon the original 

 actual weights. Similar figures for brains of 45 days and 2,021 

 days of the present series of analyses, besides corresponding fig- 

 ures from our five previous analyses, are included for comparison. 

 Reference to the data of this table has already been made. 



TABLE 7 



Distribution of sulphur and phosphorus in per cent of total sulphur and total 

 phosphorus for whole brain of all analyses 



1 In per cent of total solids. 



Note. — Nos. 1 to 5 and 11 are new data; nos. 6 to 10 are our earlier data ('18). 



Summary of present and earlier data on chemical differences in 



ataxic brains 



In tables 7 and 8 are given for the whole brain the principal 

 analytical figures obtained by us in the present and former 

 series of analyses. Samples V and VI (nos. 1 and 11 in these 

 tables) and samples I-IV and Ia-IVa (nos. 2 to 5) of the present 

 series are there calculated for the whole brain. 



In these tables the composition of the most ataxic brains of the 

 present and former series, nos. 2 and 8, respectively, may be 



