CORRELATION AND HOMOLOGY. 



31 



pairs involving a carpopodite as one variable this tendency is outweighed 

 by special positional influences affecting the variations and correlations of 

 this joint. In general the influence of homology on correlation is a 

 comparatively weak one — not nearly so strong as would probably have 

 been predicted. 



Table 14. 

 (A) PROPODITES OF LEGS I AND II, AND II AND III (CONTIGUOUS METAMERES). 



The next problem to be considered with reference to the influence of 

 homology on correlation is as to the relative effect of homology and of 

 contiguity within the metamere on the degree of correlation. Is a given 

 segment in general more or less highly correlated with the homologous 

 segment in another leg than it is with the other segments (contiguous 

 and non-contiguous) of the leg to which it belongs itself? The data 

 on this question are presented in tables 15 to 17, which are arranged on 

 the same plan as tables 12 to 14. 



