GROWTH OF THE INNER EAR OF ZLBINO RAT 



79 



fore, the difference between the ratios at 1 to 20 and 1 to 546 

 days is very small. 



At twelve days and after, the values for the height increase in 

 passing from the base to the apex, at first rapidly, then more 

 slowly. In the earlier stages this relation is obscure or reversed. 







25 



50 



5O 10O 20O 300 400 5OO 



Chart 21 The greatest height of the tunnel of Corti, table 49, figure 1, 1-1 



60 



40 







Chart 22 The greatest height of the tunnel of Corti, according to the turns 

 of the cochlea, table 49. . 



In the condensed table 53 are given the ratios in each turn. 

 While the ratio of each turn before eight days is about 1:1.1, 

 and between turns I and II remains constant in the later age, 

 that for I to III and I to IV is at 18 and 213 days decidedly 

 larger. Therefore, the increase of the height is most marked 

 in the III and IV turn, as shown in chart 24. 



