GROWTH OF THE INNER EAR OF ALBINO RAT 



71 



ing, the habenula perforata is to be considered as a 'punctum fix- 

 urn, 'at least after birth. 



9. The radial distance be'.ween the labium vestibulare and the 

 inner edge of the head of the inner pillar cell To measure the 



140 



120 



1OO 



AGE DAYS- 



25 



50 



50 1OO 2OO 3OO 40O 500 



Chart 17 The radial distance between labium vestibulare and the habenula 

 perforata, table 41, figure 10. 



25 



50 



Chart 18 The radial distance between labium vestibulare and the habenula 

 perforata according to the turns of the cochlea, table 41. 



radial breadth from the labium vestibulare to the inner edge 

 of the head of the inner pillar cell, I have used, at earlier stages, 

 as in the preceding chapter, the same small prominence as an 

 inner fixed point (fig. 4). In table 44 (chart 19) are given the 

 values for this radial distance according to age. At the bottom 

 of the last column are given the ratios from 1 to 9, 1 to 546 



