LENGTH OF THE INTERNODES 21 



Group 4. Those with a sciatic nerve measuring from 30.5 

 to 37.0 mm. : represented by 4 frogs. 



Group 5. Those with a sciatic nerve measuring from 46.0 

 mm. to 53.5 mm. : represented by 6 frogs. 



In the case of Takahashi's data, I found that the internodes 

 had been measured at the lower end of the thigh in only four 

 frogs, giving a total of 683 measurements. These frogs more- 

 over differ so widely in body weight that the data are insufficient 

 for biometric treatment. For this reason I have decided to 

 analyze Boycott's data as completely as possible and then merely 

 to compare the results obtained with Takahashi's conclusions. 



I shall present my results in the following order : 



I. A confirmation of Boycott's and Takahashi's conclusions 

 together with my own. 



II. Analysis of Boycott's data. 



a. Analytical constants. 



b. Frequency distributions. 



c. Mean and standard deviation. 



d. On the correlation in growth between internodal length 

 and the diameter of the fiber. 



III. Takahashi's observation on the length of the internode 

 in different segments of the same frog. 



IV. Correlation tables. 



I. As my principal object was to find whether there is any 

 definite law relating to the length of the internode and its diam- 

 eter in different segments of the leg from the same frog, as well 

 as in the same segment of the leg in different sized frogs, I shall 

 not touch many other points discussed by Boycott and especially 

 by Takahashi. Within the range of my examination, I confirm 

 all their findings. Since the evidence of such confirmation will 

 be found in the following pages, I shall present here only the 

 main facts brought out by myself. 



1. In a given specimen of Rana temporaria (fusca) whatever 

 its size, the length of an internode and its diameter are positively 

 correlated, though the correlation is not high; therefore it can 

 be stated that the internodal length varies as the diameter. 

 The degree of correlation increases as the frog becomes larger. 



