EXPERIMENTS WITH WASPS. 415 
The first one, I believe a worker of Vespa Germanica, 
I marked and put to some honey on September 18. 
The next morning she came for the first time 
at 7.25, and fed till 7.28, when she began flying 
about the room, and even into the next; so I thought 
it well to put her out of the window, and she then flew 
straight away to her nest. My room, as already 
mentioned, had windows on two sides; and the. nest 
was in the direction of a closed window, so that the 
wasp had to go out of her way in passing out through 
the open one. 
At 7.45 she came back. I had moved the glass 
containing the honey about two yards; and though it 
stood conspicuously, the wasp seemed to have much 
difficulty in finding it. Again she flew to the window 
in the direction of her nest, and I had as before to 
show her the way out, which I did at 8.2. 
At 8.15 she returned to the honey almost straight. 
At 8.21 she flew again to the closed window, and 
apparently could not find her way, so at 8.35 I put 
her out again. It seems obvious from this that wasps 
have a sense of direction, and do not find their way 
merely by sight. 
At 8.50 back to honey, and 8.54 again to wrong 
window ; but finding it closed, she took two or three 
turns round the room, and then flew out through the 
open window. 
At 9.24 back to the honey, and 9.27 away, first, 
however, paying a visit to the wrong window, but with- 
out alighting. 
At 9.36 back to honey; 9.39 away, but, as before, going 
first to wrong window. She was away, there- 
fore, 9 minutes. 
9.50 back to honey ; 9.53 away.’ Interval 11 minutes. 
1c. 0 ,, ” 10. 7 7) ” 11 
1 This time straight. 
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