Hardesty, spinal Nerves of the Frog. 



TABLE XI. 



87 



Table XI, giving the percentages of the amount by which the sum of the 

 trunk and dorsal branches taken just distal to the spinal ganglion, exceeds the 

 sum of the ventral and dorsal roots taken just central to the ganglion. Column 

 A contains the absolute number of the excess of fibers found in the trunk and 

 dorsal branches, column B the percentage of this excess based upon the sum 

 of the dorsal and ventral roots. In column C the percentage of the absolute 

 number of fibers contained in dorsal branches is given based upon the sum of 

 the fibers in the ventral and dorsal roots, and column D contains the absolute 

 number of these fibers composing the dorsal branches. 



From the table it is at once seen that those nerves which 

 have the greatest amount of excess in the number of fibers dis- 

 tal to the ganglion, have also the greatest number of fibers in 

 their dorsal branches. The Vlllth nerve has the lowest per- 

 centage of excess and has also the smallest dorsal branch, 

 while both the greatest amount of excess and the greatest num- 

 ber of fibers in their dorsal branches are possessed by the Vlth. 

 This nerve shows an excess of 38.3% and its dorsal branches 

 amount to 370 fibers. 



Again, if column C of the table is brought in, it is seen 

 that those nerves which have not only absolutely but propor- 

 tionally the largest dorsal branches, have also the greatest per- 

 centage of an excess of fibers in the trunk and dorsal branches. 

 The dorsal branches of the IVth, Vth and Vlth are 48%, 

 68% and 61 % respectively of the sum of the root fibers of the 

 nerves to which they belong. These are the nerves which show 

 the greatest excesses of fibers distal to their spinal ganglia. In 



