GROWTH OF THE INNER EAR OF ALBINO RAT 



57 



turn III to IV. Table 26 shows this relation. While at birth 

 the ratio is in all turns the same, 1 :1.0, at other ages it is always 

 higher. Retzius ( '84) gives the results obtained from the rabbit 

 and the cat as follows (table 27). 



TABLE 26— Condensed 



Ratios of the radial basal distance between the habenula perforata and the outer 



corner of the inntr pillar cell (resp. the inner corner of the outer pillar 



cell) at base — on age — according to the turns of the cochlea 



TABLE 27 



Distance between the habenula perforata and the outer corner of the inner pillar 



cell in n (Relzhis) 



At the earlier stage this distance in the rabbit is a little less 

 than in the rat. Soon after, however, it becomes about the same. 

 In the cat the values are generally larger than in the rat. 



5. Radial basal breadth of the outer pillar cell (including 

 the outer pillar). The measurement of the radial basal breadth 

 of the outer pillar cell is difficult. At the earlier stage, in which the 

 inner and outer pillar cells are in contact with each other along 



