The Making of Species 



be correlated with organs or structures that are 

 useful. 



Physiologists insist more and more upon the 

 close interdependence of the various parts of the 

 organism. All recent researches tend to show 

 that each of the organs has, besides its primary 

 function, a number of subordinate duties to per- 

 form, and that the removal of one organ reacts 

 on all the others. 



In face of these facts we should have expected 

 those zoologists who have followed Darwin to 

 have paid very close attention to the subject of 

 correlation. As a matter of fact, the phenomenon 

 seems to have been almost completely neglected. 

 This is an example of the manner in which the 

 superficial theories which to-day command wide 

 acceptance have tended to bar the way to 

 research. 



There seems to be, in the case of some organ- 

 isms, at any rate, a distinct correlation between 

 their colouring and their constitution or mental 

 characters. For example, the black forms of the 

 cobra, the leopard, and the jaguar are notoriously 

 bad-tempered. 



" There is," writes Col. Cunningham, on p. 

 344 of Some Indian Friends and Acquaintances, 

 " much variation in the temper of different 

 varieties of cobras, and, as is often so noticeable 

 among other sorts of animals, there would seem 

 to be a distinct correlation between darkness of 



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