EXPERIMENTS WITH COLOURED PAPERS. 317 



colours than the bees which I had previously observed, 

 still I satisfied myself that she was not colour-blind. 



I moved the green paper slightly and put the 

 honey, which, as before, was on a slip of plain glass, 

 about four feet off. She came back and lit on the green 

 paper, but finding no honey, rose again, and hawked 

 about in search of it. After 90 seconds I put the 

 green paper under the honey, and in 15 seconds she 

 found it. I then, while she was absent at the nest, 

 moved both the honey and the paper about a foot from 

 their previous positions, and placed them about a foot 

 apart. She returned as usual, hovered over the paper, 

 lit on it, rose again, flew about for a few seconds, lit 

 again on the paper, and again rose. After 2 minutes 

 had elapsed I slipped the paper under the honey, when 

 she almost immediately (within 5 seconds) lit on it. 

 It seems obvious, therefore, that she could see green. 



I then tried her with red. I placed the honey on 

 brick-red paper, and left her for an hour, from 5 P.M. to 

 6, to get accustomed to it. During this time she con- 

 tinued her usual visits. I then put the honey and the 

 coloured paper about a foot apart ; she returned first 

 to the paper and then to the honey. I then transposed 

 the honey and the paper. This seemed to puzzle her. 

 She returned to the paper, but did not settle. After 

 she had hawked about for 100 seconds I put the honey 

 on the red paper, when she settled on it at once. I 

 then put the paper and the honey again 18 inches 

 apart. As before, she returned first to the paper, but 



