136 



ANATOMICAL AND PHYSIOLOGICAL STUDIES ON 



In the nucleus-plasma ratio of the cells on the cross-section, 

 as shown in table 104, the increase with age is very regular. 

 As the diameters of the cell bodies and their nuclei decrease 

 slowly after twenty days, this increase of the ratio means that 

 the nuclei are diminishing relatively more rapidly than the 

 cytoplasm. 



Comparing these ratios from the radial and cross sections, 

 we find that they agree (table 105). 



TABLE 104 



X miens-plasma ratios of the cells in the ganglion spirale (cross-sections) 



TABLE 105 



The nucleus-plasma ratios according to the plane of the section at two age periods- 

 albino rat 



Discussion. According to the foregoing data, the maximum 

 size of the cells in the ganglion spirale, at twenty days, is in 

 cross-sections about 18.7 x 16.9 ja for the cell body and 10.3 x 

 10.0 ;x for the nucleus. Both the long and short diameter of 

 the cell body thus obtained is therefore a little less than that 

 obtained in the radial section, while the diameters for the nu- 

 cleus are the same. 



In the literature we have not found any data for the Norway 

 rat, but there arc a few observations on the size of these cells 

 in other mammals by Kolliker ('07) and von Elmer ('02). 



