ings of red — both, however, will continue to add 

 to their habiliments only such materials as do not 

 contrast with the prevailing hue of the tank. 



More surprising still, in a black environment 

 strewn with materials of every color, they invari- 

 ably choose not black but any of the other colors, 

 oftentimes the brightest, thus becoming conspicu- 

 ous rather than concealed — defeating the primary 

 purpose of camouflage. 



These facts are significant of but one thing: the 

 spider-crab's mimetic behavior is not the result of 

 higher reason but of unconscious rote, a funda- 

 mental reflex arising out of the past experiences 

 of the race. 



That all intelligence, whether it be that of man 

 or beast, is a reflex manifestation, there seems to be 

 little doubt. But it is equally transparent that such 

 intelligence, even by the most mechanistic inter- 

 pretation, must at bottom long remain a mystery. 

 The real nature of the factors which have to do 

 with the operations of the mind cannot be even 

 remotely comprehended. Again it is clear that 

 regardless of the degree of a lower animal's intel- 

 ligence, its kind, or quality, may be quite different 

 from that of an animal higher in scale. For this 



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