68 



In the cat the early data give values similar to those for the rat, 

 but the later values are lower. 



Bottcher's observations ('69) on the cat, calf, and sheep also 

 give larger values than mine. In the cat the greater ridge has 

 an average height of 75 [x and in both the others of 90 \L. Therefore, 

 even in the same animal (cat) there are large differences in the 

 data presented by different authors. 



TABLE 39 Condensed 



Ratois of the greatest height of the greater epithelial ridge (resp. of the inner sup- 

 porting cells) according to the turns of the cochlea on age 



TABLE 40 



Greatest height of the greater epithelial ridge measured through the inner supporting 



cells, in p. (Retzius) 



Gottstein ('72) thinks that the greater epithelial ridge does 

 not diminish its height for some time after birth, but through 

 the outward development of the labium tympanicum, and in 

 addition to this through the growth of the labium vestibulare, 

 the sulcus spiralis internus arises. He does not give measurements. 



