64 



DARWINISM 



CHAP. 



VARIATION 



OF 40 MALES OF 



AGEL/EUS PpCENIGEUS. 



Length] of Bill. 



• o 



• •••••o«« 



Total Length of Bird. 



• •• 



• •• 



•• •• 



••. 



• •••• •••••••••••••• 



Length 



of Tail. 



Fig. 10. 



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 toleral)ly regular curve of double 

 cuivutui-e like those shown in Fig. 11. The great divergence 



