88 Journal of Comparative Neurology. 



the IXth the excess is very nearly the same as the dorsal 

 branches ; that is, 257 against 268 fibers or 13% against 14%. 

 The specimen used for the four sets of counts recorded in 

 Table II, while being heavier, gives excesses in the trunk and 

 dorsal branches absolutely jess than those obtained in Table I, 

 although the number of fibers contained in the four nerves in- 

 volved is somewhat less. However, while the excesses are less, 

 the dorsal branches are also both absolutely and proportionally 

 less. The values obtained for the four nerves recorded in Table 

 II, are given in Table XII. 



TABLE XII. 



On comparing Table XII with Table XI it is seen that the 

 two specimens, differing in weight and in the number of fibers, 

 agree in the general relation existing between the excess of fi- 

 bers in the trunk and dorsal branches and the amount of the 

 dorsal branches. 



This approach to a conformity or correlation between the 

 excess of fibers distal to the spinal ganglion and the number of 

 fibers which do not enter into the formation of the trunk, 

 may be a mere coincidence and entirely without significance. 

 Indeed, in the Vlllth nerve (Table I), for example, as many as 

 131 fibers of the excess, are necessarily contained in the trunk; 

 and, in case of the Vlth, on the other hand, the trunk lacks 

 126 fibers of containing as many as there are in the two roots. 



IX. Discussion of the Observations and Comparisons with 

 THE Results of other Observers. 

 I. The excess. 

 That there does occur a greater number of fibers distal to 



