Mr Tylor Quoted 



more rapidly than that which forms at another ; 

 this, of course, will result in a preponderance in 

 the organism of the colour which is produced at 

 the former centre. 



Further, we must bear in mind that the develop- 

 ment of each colour-producing unit is largely 

 affected by conditions external to it, as we shall 

 see when dealing with Sexual Dimorphism. 



More than one naturalist, who has paid careful 

 attention to the subject of animal colouration, has 

 perceived that through the apparently endless 

 diversity of the colouring of organisms something 

 like order runs. 



Over thirty years ago Mr Alfred Tylor called 

 attention to this important fact. That observer, 

 whose views met with the approval of Wallace, 

 was of opinion that colour follows structure, and 

 that in a many-hued animal it changes at points 

 where the function changes. 



"If," writes Mr Tylor, "we take highly 

 decorated species that is, animals marked by 

 alternate dark or light bands or spots, such as 

 the zebra, some deer, or the carnivora, we find, 

 first, that the region of the spinal column is 

 marked by a dark stripe ; secondly, that the 

 regions of the appendages, or limbs, are differ- 

 ently marked ; thirdly, that the flanks are striped 

 or spotted, along or between the regions of the 

 lines of the ribs ; fourthly, that the shoulder and 

 hip regions are marked by curved lines ; fifthly, 



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