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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 simi- 

 lar 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 commu- 

 nicating with the outside by an india-rubber tube 

 6 inches long and ^ inch in diameter. The wasp, how- 

 ever, soon got accustomed to it, and went in and out 

 without much loss of time- The 22nd was finer ; and 



