109 
April, 1887.] history society of Wisconsin. 
of the second day, August 15, we moved the blue paper a foot 
and a half to the west, thus placing it as nearly as possible in 
their line of flight, and substitute for it a yellow paper which 
was a more decided contrast to the blue than the blue had been 
to the red. In the first seven minutes after the change, from 
9:40-9:47, 270 wasps returned. None of these flew straight into 
the true entrance although many passed directly over it; all 
hovered first over the false, many going in ; some came out and 
went back into it eight or ten times, after flying over the true 
and returning to it. So closely was the sensation of the blue 
color associated with the idea of their nest. 
From 9:50-9:55 205 wasps entered first the false and then the 
true hole ; not one flew straight into the true, but six hesitated 
over it and then went in without going to the false. 
We now left the nest for forty-five minutes. At 10:40 one 
of us returned to see how far they had become reconciled to the 
yellow paper. 
From 10:40 to 10:45, 184 entered false hole. 
“ 10:45“ 10:50,202 “ true “ (This includes those that 
went first to the false 
hole as well as those 
that flew directly into 
the true.) 
From 10:55 “ 10:55, 32 flew straight into the true hole. 
The nest was then left for an hour and fifty minutes. 
From 12:45 to 12:50,76 entered the false hole. Many came to it but dis¬ 
covered their mistake 
before entering. 
1-00 191 “ true “ (This includes those that 
went first to the false.) 
1:05, 81 flew straight into true hole. 
Later in the afternoon other observations were taken. 
From 3:30 to 3:35 of 100 wasps 49 entered false hole. 
“ 3:36 “ 3:41 “ 108 “ 33 first visited false hole. 
“ 5:33 “ 5:38 44 46 44 13 “ entered 
“ 5:40 44 5:46 44 49 44 5 44 visited 
On the next day at 9:25 a. m. two wasps entered the false hole. 
The first stayed some time, came out, hovered an wen ac 
12:55 
1:00 
