426 



This was her last visit for the evening, and she thus 

 made no less than 116 visits in the day, during which 

 time only three other wasps found the honey, though it 

 was lying exposed on a table at an open window. It 

 will be seen that she worked with the utmost industry. 



No doubt, however, if a wasp is put to honey in an 

 exposed place, other wasps gradually find their way to 

 it. In the preceding experiments some few, though 

 but few, did so. I then thought I would try a similar 

 experiment with concealed honey. Accordingly, on 

 September 20, I marked a wasp and put her to some 

 honey, which she visited assiduously. The following 

 morning I opened my window at 6, and she made her 

 first visit at 6.27, the temperature being 61° Fahr. I 

 then placed the honey in a box communicating with 

 the outside by an india-rubber tube 6 inches long and 

 \ inch in diameter. The wasp, however, soon got accus- 

 tomed to it, and went in and out without much loss of 

 time. The 22nd was finer ; and when I opened my 

 window at 6 in the morning, she was already waiting 

 outside, the temperature being 61°. The 22rd was 

 rather colder, and she came first at 6.20, the temperature 

 being again 61°. 



I was not at home during these days ; but, as far as 



