266 C. H. TURNER. 



and tico red discs. On the blue disc and on one of the red discs 

 honey was placed. 



During the time these discs were under continuous observation, 

 fifteen visits were made to the red disc that was supplied with 

 honey, one bee alighted on the red disc that did not bear honey, 

 and three bees alighted on the blue disc. These three bees visited 

 the blue disc at the same time; one bee alighted on the disc, 

 and then almost immediately the other two followed. 



While the three bees just mentioned were on the blue disc, the rod 

 supporting that disc was gently removed to a portion of the melilotus 

 patch that did not contain any of my experimental discs. 



One by one, the bees made a careful orienting flight and then 

 flew away. These discs were no longer kept under continuous 

 observation; but, at regular intervals, they were visited and the 

 honey replenished. On those occasions I would watch each disc 

 for about five minutes. On each trip I found three bees visiting 

 the blue disc. The disc might be free from bees when I arrived ; 

 in a short time, however, three bees would arrive. They did 

 not arrive simultaneously; but, before the first arrival had left 

 two more would be there. I therefore concluded that the same 

 three bees that discovered the honey on the blue disc had con- 

 tinued to visit it, and that no other bees had grasped the signifi- 

 cance of that blue disc. (Unfortunately, for the reason mentioned 

 above, these bees were not marked and one cannot be absolutely 

 certain of their identity; but, from a knowledge of the habits of 

 bees when foraging and of the time required to make a trip to 

 the hive, I feel certain that they were the same bees.) 



EXPERIMENT 14. While several bees were collecting honey from 

 one of the red discs that capped one of my rods, the rod was gently 

 carried fifteen feet in the direction of the hive and erected in another 

 patch of melilotus. 



One by one, the bees made a careful orienting flight and then 

 flew away. In a short time they had returned. Often eight 

 or ten bees would be on the disc at the same time. While I was 

 taking my notes, some of the bees hovered within a short distance 

 of the small pad (13X8 cm.) on which I was writing, as though 

 they were examining it. From now on this behavior was common. 



EXPERIMENT 15. While ten bees were foraging on the red disc 



