112 Journal of Comparative Neurology. 



Untersuchungen hieriiber zu machen, bin ich indess noch nicht 



in der Lage gewesen." 



The above interpretation given by Buhler concerning the 



small cells can not be accepted as far as white rats are concerned, 



for he regarded the small cells as replacing the degenerated 



large nerve cells ; if this were the case, then the total number of 



the spirul ganglion cells must decrease, but the preceding table 



shows that the total number is approximately constant. 



B. Ratios of Large to Small Cells. 



Our assumption that the small cells are in an immature or 



growing condition, and are more or less transformed into large 



cells, is proved from the following table which shows that the 



relative number of the large cells steadily increases. 



TABLE II. 



Showing the ratios of the large to the small cells. * 



Body weiglit - Ratio 



Grams. Large Cells. Small Cells. Total Number. L. and S. 



From the table it is clear that the number of the large cells 

 at 167 grams in each region is nearly twice that at 10 grams, 

 showing a ratio of 1:2 approximately. Further, the ratios be- 

 tween the large and small cells in different regions of the animal 

 at the same age is always constant. For instance, the 10.3 gram 

 white rat shows a ratio between the large and small at the three 

 regions of 1:3.4, i:3-5 ^^^ I-3-4 respectively; in the 24.5 

 gram rat the ratio is 1:3, 1:2.9 and 1:3 respectively, etc. Fin- 

 ally, the 167 gram rat gives the ratio of 1:1.4 to 1:1.5. From 

 this we can say that each spinal ganglion in the individual at a 



