No. 486] 



fairly be questioned whether the lower animals are capable of 

 color vision. The biological importance of this problem is very 

 great, since prevalent theories of the development of the colors 

 of flowers, and the bright plumage of male birds, assume a color 

 perception in insects and female birds essentially like that in man. 

 To learn what a bee actually sees has been thought impossible 

 since it re(|uircs that otic should possess the nervous system of 



Tiierc is a laruv litcralun^ (Icaliiiu' witli the distinctions which 

 the lower aiiiiuals make Ix'twccti vai-ioii^ colors, but the factor of 

 iiit(Mi>ity or briulitiic» lias seitloiii been satisfactorily eliminated. 

 The troui fishei'iiiaii is eonfidcMit that one lisli, at least, discrimi- 

 nates eoloiN w ith |)recisi(.ii. ( 'aret'iil (^xperiiiients with the chub, 



to (eliminate briu'litiu-ss, indicate that the chub distinguishes red 



