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THE POPULAR SCIENCE MONTHLY. 



golden, and following 

 this a copper - colored 

 tint ; and so on through 

 all conceivable hues, 

 until finally, the end 

 having come, change 

 is interrupted in its 

 course, and two tints 

 are left in possession 

 of the body — one in 

 the act of disappear- 

 ing, the other about to 

 spread itself over the 

 surface. That portion 

 exposed to sunlight 

 changes more rapidly, 

 f while the under side is 

 i less gorgeous. Here we 

 § see a peculiar property 

 1, possessed by many ani- 

 b- mals widely separated 

 g in the scale of life — 

 a that of changing color 

 | at will, either to suit 

 the surrounding shade, 

 as illustrated in the 

 «« chameleon and dol- 

 | phin, or to attract cer- 

 tain kinds of prey, as 

 seen in many of the 

 lower marine animals 

 — which becomes so 

 much a habit in the 

 case under considera- 

 tion that, even when 

 death is at hand, the 

 changes are all passed 

 through involuntarily. 

 Stormy petrels, or 

 Mother Carey's chick- 

 ens, as they are more 

 commonly called, fol- 

 low the outbound ves- 

 sel in large flocks, gath- 

 ering about as soon as land is lost to view, and remaining until the 

 shore is once more sighted, unless a violent storm drives them 



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