GROWTH OF THE INNER EAR OF ALBINO RAT 



85 



Comparing the values of the angle in each turn according to 

 age, there is no clear evidence that it increases from base to apex, 

 though it tends to be largest in turn III and next largest in turn 

 II. The condensed table 59 shows these relations. Retzius 

 ('84) finds this angle in the rabbit and cat to be as in table 60. 



TABLE 56 — Condensed 



Ratios of the greatest height of Hensen's supporting cells according to the turns of 



the cochlea 



TABLE 57 



Greatest height of Hensen's supporting cells in M (Retzius) 



Retzius also finds in man in the basal turn 25°, in the middle 

 35°, and in the apical 23°. Thus the angle always increases with 

 age, but has different absolute values in different mammals and 

 always tends to be greater in the middle turns. 



15. Lengths of the inner and outer pillar cells. The measure- 

 ments of length w^ere taken as shown by lines 1-1, and 2-2 as in 

 figure 2. This does not give the total length, but the length 

 from the base to the point, just below the joint. As is well 



