318 EXPEEIMENTS WITH COLOURED PAPEES. 



almost immediately went to the honey. In a similar 

 manner I satisfied myself that she could see yellow. 



Again, on August 181 experimented on two wasps, 

 one of which had been coming more or less regu- 

 larly to some honey on yellow paper for four days, the 

 other for twelve coming, that is to say, for several 

 days, the whole day long, and on all the others, with 

 two or three exceptions, for at least three hours in the 

 day. Both, therefore, had got well used to the yellow 

 paper. I then put blue paper where the yellow had 

 been, and put the yellow paper with some honey 

 on it about a foot off. Both the wasps returned to the 

 honey on the blue paper. I then moved both the papers 

 about a foot, but so that the blue was somewhat nearer 

 the original position. Both again returned to the blue. 

 I then transposed the colours, and they both returned 

 to the yellow. 



Very similar results were given by the wasp watched 

 on September 11. After she had made twenty visits 

 to honey on blue paper, I put it on yellow paper, and 

 moved the blue 12 inches off. She came back to the 

 yellow. I then put vermilion instead of yellow ; she 

 came back to the vermilion. I transposed the colours ; 

 she came back to the vermilion. 



I put white instead of vermilion; she came to 



the blue. 



green white ; she came to the blue. 

 orange green ; she came to the blue. 



I transposed the colours ; she returned to the orange. 



