1 76 'Journal of Comparative Neurology and Psychology. 



TABLE 4. 



Showing the average length of the internodes on fibers of Hke diameter at the several 

 levels in the nerves to the leg of Frog 5. Body weight, 31 grams; total length, 

 192 mm. At each level the measurements are grouped in three classes accord- 

 ing to diameter. The number in parentheses indicates the number of measure- 

 ments. 



Level. 



Internodes. 



Internodes. 



Internodes. 



Diameter 



Diameter 



Diameter 



Diameter 



Diameter 5 



Diameter 5 



X{1 



Diameter. 



(4^) 

 (79) 



Zjl 



(38) 



2/£ 

 (58) 



in 



(74) 



2/i 

 (7^) 



611 

 645 

 769 

 646 

 636 

 608 

 818 



6.4/i 



(47) 

 6.3;: 



(38) 



6.3/i 

 (36) 



(30) 

 6.4/( 



(31) 



(3O 

 6.3/i 



(^5) 



623 

 706 

 902 

 787 

 870 

 787 

 917 



7-3/' 

 (34) 

 7-4« 

 (40) 

 7 • 2," 

 (17) 

 7-3." 

 (50) 

 7-4/' 

 (26) 



(,8) 



7 ■ I," 

 (9) 



805 



836 

 900 



744 



When the data in this table are read horizontally, we observe 

 that in all but one instance out of the twenty-one (T^, 6.3/« and 'J-'^^fj) 

 the fibers with greater diameter have the longer internodes. 

 When the measurements are read vertically however the length 

 of the internodes on a fiber of a given diameter varies irregularly 

 from level to level. • Fig. 3 illustrates these relations. 



In order to plot these internodal lengths fairly, the diameters 

 of the classes at each level must be made exactly equal, hence they 

 are all reduced for the purposes of this figure to precisely 5.3//, 

 6.3/^ and 7.3/i. The reduction is made by the method of simple 

 proportion. By reason of this reduction, the internodal values 

 are in some cases slightly different in the figures from those in the 

 tables but at most these differences are slight however and 

 hardly detectable on figures of the size here used. 



As it will be necessary for comparison with Tables 6 and 7, to 

 have the measurements from Frog 5 for the levels iSj, T and T^ 

 brought together, we now present the data in the accornpanying 

 Table 5. 



It is to be noted however, in the case of all three diameter classes, 

 that the fibers at T^y the level of the foot, give higher values than 



