950 



1. Table showing the total numbers of axons in the dorsal and ventral roots of animals of 

 various ages in the same species and of different species. 



Ao-o in I Total number of 

 ^^^ '" I axons in all the 



Species. 



Relation 

 days orlrootsofthespinal between the 

 ! nerves. numbers m 



length ' . 



in cms. ventral Dorsal 

 roots. roots. 



Average Percentage 



total. 



of increase. 



the dorsal 



and ventral 



roots. 



V. r I D. r. V. r. D. r. 



Remarks. 



Bu/o vulgaris. 1 . 6 



1.77 



3 



4.5 

 5.8 

 6.8 

 7.9 

 9.4 



8,03 



average 



average 



226 



average 



1.3 : 1 



1.4 : 1 

 1.35: 1 

 1.27 : 1 

 1.48 : 1 

 1.3 : 1 

 1.46 : 1 



1.41 : 1 



1 



1 

 1 

 1 

 1 



1.9 : 1 



3281 4357 



5854 8276 



53260 '94109 



The average 

 numbers for 

 the most dif- 

 ferent sizes 

 and ages of 

 animals are 

 not reliable, 

 78 93.8 because the 

 increase in 



I the axons 

 thatisshown 

 in the table 

 does not pro- 

 ceed at an 



I equal pace 

 during the 

 wholeperiod 

 of growth. 



24554 



52469 



116.9 79 3 



