46 Journal of Comparative Neurology and Psychology. 



tained numbers indicating a rate of gain in this one pair of 

 nerves of about 3 ventral root fibers, t^ dorsal root fibers, and 



TABLE IV. 

 (Frog) 



Table IV. The base numbers are taken from Tables II and III. The 

 specimens are entered in two groups, one of the four larger frogs, the other of the 

 three smaller. Opposite the individual body weights are the sums of the gang- 

 lion cells, and of the nerve fibers in the localities indicated ot the three nerves. 

 The table allows a comparison of the number of cells the average specimen of 

 each group would possess in the spinal ganglia of the three nerves (col. A), and 

 of the number of fibers in the dorsal roots (col. B), ventral roots (col. C), the 

 trunks and dorsal branches combined (col. D), the number of fibers in 

 the dorsal branches alone (col. E), and finallj- the ratios of the ganglion 

 cells to the dorsal root fibers (col. F) and the ratios of the fibers in the ventral 

 roots to the fibers in the dorsal root (col. G). In the last two lines across the 

 table are given (i) the estimated number of cells and of fibers in the given parts 

 of the nerve gained per gram of weight gained and (2) the gains in proportion 

 to the numbers contained in each is expressed in percentages. 



