'.is 



ANATOMICAL AND PHYSIOLOGICAL STUDIES ON 



The weighted values for the volumes of the inner and outer 

 hair colls in each turn are given in [j. 3 table 70. At the bottom 

 of each column is given the ratio from 1 to 12, 1 to 20, 1 to 546, 

 and 20 to 546 days of age. While the volume at birth is largest 

 in turn I and smallest in turn IV, that in turn III is largest at 



1600 

 1400 



1200 



1000 



800 



600 



400 



200 











25 



50 



50 100 200 300 400 500 



( 'hart 36 The volume of outer hair cells and of their nuclei, in cubic micra, 

 les 67 and 69. 



Volume of outer hair cells. 



Volume of nuclei of outer hair cells. 



six days. After nine days the volume increases always from base 

 to apex. 



Comparing the weighted vo'ume in each turn according to 

 age, we find that the rate of increase in volume is smallest in 

 turn I (1.3 to 1.2) and largest in turn IV (3.9 to 4.6) (table 70). 



In table 72 are given the weighted values for the diameters 

 of the nuclei of the inner and outer hair cells in each turn. Thev 



