Hardest Y, Spinal Nerves of. the Frog. 



349 



TABLE IV. 



Table IV.— This table, based upon figures taken from Table I, compares 

 the averages of two groups ; one consisting of the seven smallest frogs, the 

 ofhtr of the five largest. The table is intended to offer a comparison (i) of the 

 number of fibers the average specimen of each group would possess in the ven- 

 tral root, dorsal root, and trunk and dorsal branches combined of its 6th. spinal 

 nerve ; (2) of the average number of ventral root, dorsal root, and fibers distal 

 to the ganglion possessed by each of the specimens of each group per gram of 

 weight; and {3) the table allows one to compare the proportions existing be- 

 tween the average numbers of fibers per gram of weight found for the three 

 localities of the nerve. 



The relations which Table IV is intended to show are the 

 following : 



(i) The smaller specimen has a greater number of fibers 

 in proper! ion to its weight than the larger one. 



(2) The number of dorsal root fibers per gram of weight 

 is gre;:trr in b'.th cases than the number of ventral root fibers. 



(3) As to be expected after considering the distal excess, 

 the average frog possesses a greater number of fibers in the 

 trunk and dorsal branches combined than in the two roots. This 

 shows that the number of fibers in the trunk and dorsal branches 

 has increased more rapidly than in either or both roots. 



