66 



ANATOMICAL AND PHYSIOLOGICAL STUDIES ON 



after the furrow appears, passes outward towards the inner 

 supporting cells. Thus the greater ridge decreases in thickness 

 from birth to nine days of age, then increases gradually to twenty 

 days. After twenty-five days the values diminish again very 

 slowly but continuously. 



In table 38 (charts 15 and 16) are given the values of the greatest 

 height of the greater epithelial ridge from the basilar membrane 



TABLE 38 



Greatest height of the greater epithelial ridge (resp. of the inner supporting cells) 



on age (charts 15 and 16) 



Ratios 1 — 9 days 



12— 20 " 



12—546 " 



20—546 " 



1—546 " 



0.6 

 1.3 

 1.2 



0.9 

 0.8 



through the summit of the supporting cells, according to age. 

 At the bottom of the last column is given the ratio at 1 to 9, 

 1 to 546, 12 to 20, 12 to 546, and 20 to 546 days of age. 



The values in turn I are at birth the largest, but at three 

 days the relation is reversed and remains so in the later age 

 groups. Table 39 shows this relation from the condensed data. 



Etetzius ('84) gives in the rabbit and cat the following values 

 (table 40; . 





