GROWTH OF THE INNER EAR OF ALBINO RAT 



51 



According to the turn of the cochlea, the values from nine 

 to fifteen days become gradually larger on passing from the 

 base toward the apex. After twenty days, however, this relation 

 vanishes, and the values become nearly the same through all 



TABLE 19 

 Radial basal breadth of the inner pillar — on age (chart 8) 



days- 

 1 



3 



6 



9 



12 



15 



20 



25 



50 



100 



150 



257 



366 



546 



WEIGHT 

 BODT 



grams 

 5 

 8 



11 



10 



13 



13 



29 



36 



59 

 112 

 183 

 137 

 181 

 255 



Ratios 6 — 546 days 

 20—546 " 





 

 29 

 28 

 18 

 18 

 14 

 14 

 14 

 14 

 15 

 15 

 16 

 15 



TURNS OF THE COCHLEA M 



A verage 





 

 29 

 31 

 21 

 19 

 15 

 15 

 14 

 14 

 15 

 15 

 16 

 15 

 :0 

 : 1. 



o 



25 



50 50 100 200 300 400 500 



Chart 8. The radial basal breadth of the inner pillar (not pillar cell), 

 table 19, figure 2, distance 3. 



the turns. In table 20 the ratios of the turns I to II, I to III, 

 and I to IV are given for three age groups (condensed from table 

 191 



