240 



KENJI NITTONO 



the observations are limited to the young animals, before eighty 

 days of age, the following results are found : 



Larger animals. 

 Smaller animals 

 Ratio 



MEAN BODY 

 WEIGHT 



34.0 



30.1 



1:0.89 



MEAN DIAME- 

 TER CELL 

 BODY 



40.9 



40.2 



1:0.98 



MEAN 

 DIAMETER 

 NUCLEUS 



M 



15.4 



15.0 



1:0.97 



In these younger rats the difference of the averaged body 

 weights is smaller than that for the total average. If, therefore, 

 the size of the cell bodies and nuclei follows closely the body 

 weight, their differences should decrease as the difference in the 

 body weights decreases. This does not occur. The relations 

 between the cell bodies and the nuclei remain about the same 

 as those for the entire series. We conclude, therefore, that in 

 albino rats of the same age but of dissimilar body weights, the 

 smaller animal tends to have slightly smaller cells and nuclei 

 in the gasserian ganglion, but that this ganglion, like the central 

 nervous system, is but little influenced by the conditions which 

 cause moderate deviations in the body weight. 



COMPARISON BETWEEN THE RIGHT AND LEFT SIDES 



The comparison was made in nineteen cases in this series in 

 which the ganglia from both sides were examined. The results 

 are given in table 6. 



From table 6 we find that the average values of the diameters 

 of the ganglion cells and the nuclei are slightly greater on the 

 right side than on the left. On the right side the cell bodies and 

 nuclei give 44.2 ix and 15.9 m, respectively, while on the left they 

 give 44.0 /x and 15.7 //. However, the difference betw^een right 

 and left is so slight that we are not justified in attaching any 

 significance to it, especially as the plus and minus cases are also 

 nearly equal in number. 



