GROWTH OF THE INNER EAR OF ALBINO RAT 



143 



constants for the determinations based on 160 cells in each age 

 group are given in table 111 for the radial vertical sections 

 and in table 112 for the cross-sections. 



TABLE 111 



.4 nalytical co?istants 6 giving the mean, standard deviation and coefficient of variability 

 with their respective probable errors for the diameters of the cells and their 

 nuclei of the ganglion spirale in radial vertical section 



AGE 



days 



1 

 3 



6 



9 



12 



15 



20 



25 



50 



100 



150 



257 



360 



546 



FOR TOTAL NUMBER OF CELLS 



Cell 

 Nucleus 



Cell 



Nucleus 



Cell 



Nucleus 



Cell 



Nucleus 



Cell 



Nucleus 



Cell 



Nucleus 



Cell 



Nucleus 



Cell 



Nucleus 



Cell 



Nucleus 



Cell 



Nucleus 



Cell 



Nucleus 



Cell 



Nucleus 



Cell 



Nucleus 



Cell 



Nucleus 



Cell 



Nucleus 



Mean 



10.2 



7.8 

 11.3 



7.9 

 12.6 



8.4 

 13.1 



8.5 

 13.4 



8.4 

 14.6 



8.7 

 17.8 

 10.0 

 17.3 



9.9 

 17.2 



9.7 

 16.5 



9.4 

 16.4 



9.1 

 16.6 



9.5 

 16.7 



9.3 

 16.7 



9.3 



0.05 

 0.02 

 0.03 

 0.02 

 0.04 

 0.03 

 0.03 

 0.03 

 0.05 

 0.03 

 0.04 

 0.03 

 0.06 

 0.02 

 0.05 

 0.02 

 0.04 

 0.02 

 0.03 

 ± 0.02 

 ± 0.03 

 ± 0.02 

 ±0.06 

 ± 0.02 

 ± 0.05 

 ± . 03 

 ± 0.06 

 ± . 02 



Conclusion. For the study of the growth of the nerve cells 

 in the ganglion spirale fourteen age groups were taken and the 

 data obtained from the 160 largest cells in each age group. 

 Besides these, six age groups, representing six cochleas, were 

 examined in cross-sections to determine the form of the ganglion 



