i8g6. THE PIGMENTS OF ANIMALS. 177 



Urech's suggestions, though of great interest, are difficult to 

 work out in detail, and are probably premature. As to the signifi- 

 cance of the colour change in the Vanessa, opinions are still divided. 

 Spuler opposes the theory of its phylogenetic significance and the 

 correlated assumption that the Vanessa were once all white. Certainly, 

 at the present time, the trend of scientific opinion seems against such 

 detailed applications of the Recapitulation Theory. 



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1. Chatin, A., and Muntz, A. — "Etude chimique sur la nature et les causes du 



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Nature, vol. xlv., pp. 197, 198 ; 1891. 

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" Animal Coloration," 1892. 



M. I. Newbigin. 



