l8o Journal of Comparative Neurology and Psychology. 



the fibers increase in diameter, and also along a given fiber from 

 Si towards the foot T^. 



TABLE 7. 



Showing the average length of the internodes at the several levels in the nerves 

 to the leg of Frog 3. Body weight, 26 grams; total length, 166 mm. At each 

 level the measurements are grouped in three classes according to diameter. \he 

 numbers in parentheses indicate the number of measurements. 



Level. 



Internodes. 



Internodes. 



Internodes. 



Diameter 3-9/^ 



(12) 416 

 Diameter 4-0/< 



(13) 435 

 Diameter 4-o/i 



(24) 578 



5 . 2 r( 



5 • ^i" 

 (64) 



s-y- 



(S3) 



520 

 601 

 701 



6-3/i 

 6.3/i 



6.3/£ 

 (63) 



578 

 692 

 805 



Fis. 6 exhibits these relations in the form of curves. 



Level 3| 



M 

 600 



000 



-^00 



soo 



o 



5.. 3 ' 



Hip 



6.3 



— ■ — T5.5 



Cr ur oiai?e> al 

 4.0 



Knee 



o 10 so ^o 60 ao 100 ISO 



130 



' Fir.. 6. Showing the average length of the internodes at the several levels, S-^, T and T^, on fibers 

 4«, 5.3/i and 6. 3/1 in diameter, from Frog 3. The other indications as in Fig. 5. 



As the foregoing represents all the data collected in connection 

 v^ith'this question, we return to a discussion of the fundamental 

 point, namely, the length of the internodes on fibers of a given 

 diameter through their entire extent from S-^ towards the foot T^. 

 An examination of Tables 5, 6 and 7 shows: 



