Hardesty, spiral Nerves of the Frog. 353 



taken from Tables I and III. The figures are those for the 

 percentage amount of variation per millimeter of length ob- 

 tained in the manner discussed under Table III. 

 TABLE VI, 



Table VI. — Gives the percentage variations par millimeter of length from 

 Table III, arranged with reference to the month in which the frogs were pre- 

 pared. The entries are divided into two seasonal groups and under each group 

 are the averages for the dorsal and ventral roots and trunk. The representatives 

 of a given month are entered in the order of their weights. 



The highest set of variations in the dorsal root occurs in 

 June and the next highest in September. Also the highest sets 

 of variations in the trunk occur during these months. Since 

 the spinal ganglion also contributes fibers to the formation of 

 the trunk, it might be said that the figures indicate the spinal 

 ganglion to be more active during these months. Beyond this, 

 there is little conformity between the individual localities for a 

 given month. Taken as a whole, the averages show that there 

 is a tendency to maintain a more rapid ingrowth of new fibers 

 during the season including June, September and October. 

 That the average for the ventral root is somewhat greater for 

 January and April than for the other group is due to one excep- 

 tional case in each group. The ventral root of the January 

 frog of 5.9 grams is found to stand exceptionally high, while 

 in the ventral root of the June frog of 4.7 grams, no variation 

 at all is found. 



