318 EXPERIMENTS WITH COLOURED PAPERS. 
almost immediately went to the honey, In a similar 
manner I satisfied myself that she could see yellow. 
Again, on August 18 I 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. Ithen 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 theblue. 
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. Ithen 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 35 white ; she came to the blue. 
» orange ,, green ; she came to the blue. 
I transposed the colours ; she returned to the orange, 
