64 
DARWINISM 
CHAP. 
VARIATION 
of 40 MALES of 
AGEL/EUS PJHENICEUS. 
e«o 
Length\of Bill. 
• | • 
• •••••••• 
•«••••••••••• 
Total Len /t/i of Bird. 
• • 
• •• 
•• •• 
• • 
• •••• •••••••••••••© 
Length 
of Tail. 
•• 
• ••• 
Length of Wing. 
• «•« 
Amount of 
BILL. ^ 
n,L. 1 
Variation. 
LENGTH | 
WING. 4- 
o 
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 he 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 
