90 ANATOMICAL AND PHYSIOLOGICAL STUDIES ON 



As table 62 shows, the values in these mammals are larger 

 than those in the albino rat a result which fits with our previous 

 observations. 



When we consider the length of the inner pillar cells alone, 

 we see that the values (chart 29) here also increases from three 

 days to twenty days, but not so largely as in the combined values 

 of the inner and outer pillar cells. After twenty days the values 

 for the inner pillar cells decrease slightly. This relation is shown 

 by the ratios at the bottom of the corresponding column. That 

 the increase progresses from the base to the apex, being most 

 marked in turn III, is illustrated in chart 30. The condensed 

 table 63 shows those relations also. The one-day-old rat is an 

 exception. 



We turn now to the growth in the length of the outer pillar 

 cells. As we see in table 61 (chart 31), the length of the outer 

 pillar cell does not increase so much from one to nine days as the 

 inner pillar cell did. At twelve days, however, the increase in 

 length is very marked, that is, 2.2 times as much as at nine days. 



After the outer pillar cell reaches its maximum at twenty 

 days, it decreases only slightly with advancing age. The ratios 

 at the bottom of the corresponding column show this relation 

 clearly. The length increases from base to apex, though this 

 relation is not well established until twelve days, as shown in 

 table 61 and chart 32. The ratios of the outer pillar cells ac- 

 cording to the turns of the cochlea are shown in table 64. 



The inner and outer pillar cells show marked differences in 

 their growth. While at the earlier ages the length of the inner 

 is greater than that of the outer, yet after twelve days this 

 relation is reversed. Moreover, from nine to twelve days the 

 growth is gradual in the inner pillar cells, but rapid in the outer. 

 The condensed table 65 shows the values for the length of the 

 inner and outer pillar cells separately. In the last column are 

 given the ratios between them. 



In the accompanying table 66 I have compared the values 

 obtained in the rat with those given by other authors. 



As table 66 shows, the absolute values differ in various animals. 

 However, the ratios between the values for the inner and outer 



