64 



DARWINISM 



CHAP. 



VARIATION 

 of 40 MALES of 



AGEL/EUS PHCENICEUS. 



Length] of Bill. 



• © 



• o • • • • • o • 

 • oo«o«o«o«oo«« • 



Total Length of Bird. 



©•© 



o •»&*• &::••••::•• 



0/ ra//. 

 • ••• 



Length 



©•©•'•SSSoe 



Length of Wing. 



Amount of 



1_ 



6 



1 



BILL, -k 



TAIL 



4 

 Fig. 10, 



Variation . 

 LENGTH | 



o 



of variation of each part would increase also, at first rather 

 rapidly and then more slowly ; while gaps and irregularities 



Curves of Variation 

 Fig. 11. 



would be gradually filled up, and at length the distribution 

 of the dots would indicate a tolerably regular curve of double 

 curvature like those shown in Fig. 11. The great divergence 



