GROWTH OF THE INNER EAR OF ALBINO RAT 



81 



Retzius ('84) finds in the rabbit and cat the [values for this 

 height given in (table 54). 



Comparing these average numbers with mine, it appears that 

 the height in the rabbit is greater, and in the cat smaller than 



u 



70 

 5O 

 30 

 10 



k 



AGE 



o 



25 5O 50 |OO 2OO 3OO 40O 5OO 



Chart 23 The height of the papilla spiralis at the third series of the outer 

 hair cells, table 52, figure 1, 2-2. 



90 



70 



50 



30 



10 



AGE DA.YS- 



O 



25 



50 



5O 1OO 2OO 3OO 4OO 5OO 



Chart 24 The height of the papilla spiralis at the third series of the outer 

 hair cells, according to the turns of the cochlea, table 52. 



in the rat. In both animals the values increase rapidly at ten 

 to eleven days of age, as in the albino rat, but the height in these 

 animals is at the earlier stage almost twice as large as in the rat. 

 Hardesty ('15) measured the thickness of the organ of Corti in 



