MERIDIANS OF DISTRIBUTION. 



45 



parts, lends itself readily for purposes of comparison 

 ciated when exhibited diagrammatically : 



Its 



evidence is again best appre 



DIAGRAM 3 





Distribution by structure 



General percentage 

 Beaked corollas 

 Beakless do. 



«*• 



• •• 



... 49'* 



... 50-6 



Beaked 



5*°' 



America 



Beakless 



48%. 





Structure thus directly confirms the evidence from endemic percentag 



as 



igard 



the Jap 



the American, and the European meridians of distribution, while curiously 



ly 



but still equally completely, confirms the evidence from 



demic percentag 



* , 



Is Sards' 'the" Siberian ; whereas along the other three meridians the percentage of 



corollas of archaic type gradually falls towards their equatorial limits, along the Siben 



meridian it actually increases, 

 strong ' 



This 



ptional arrangement affords on the one hand 



confirmation of the already almost conclus 



dence that the Caucasus 



is a 



projection of the 



Siberian meridian, and 



on the other makes it almost impossible either 



that the meridian of distribution for China 



derived from that of Siberia, or that the 



meridian for the Himalay 



is 



extended from that of the Caucasus 



At the 



time 



direct evidence that the merid 



there is 



thence to the Himala) 



of Japan is projected 



China and extends 



Another character that admits of comparati 



e use is colour. As already explained, 



there are practically two colours in 



the gt 



yellow and red 



Yellow being perhaps 



