DISTINGUISHING COLOUES. 301 



vation till the 28th, but not with reference to 

 colours. 



August 24. — At 7.45 I put another bee to hone}' 

 on green paper, to which she kept on returning till 

 9.44. The next day (August 25) she came at 7.38, and 

 I let her come to the green paper tiU 9. The follow- 

 ing morning she returned at 6 A.M., coming back as 

 foUows, viz. : — 



I now put orange in place of green, and put the 

 green a foot off. 



At 7.24 she returned to the green. I replaced the 

 paper with the bee on it ; and when she had gone I 

 put light blue in place of the green, and again moved 

 the green a foot off. 



At 7.36 she returned to the blue. I again replaced 

 the paper with the bee on it ; and when she had gone ] 

 put yellow in place of the green, and again moved the 

 green a foot off. 



At 7.44 she returned to the green I then did 



