EXPERIMENTS WITH WASPS. 415 



The first one, I believe a worker of Vespa Oermanica, 

 1 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 

 abont 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 

 difiiculty 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. 

 10. „ „ 10. 7 „ „ 11 „ 



' This time straight. 



