No. 527] COLOR SENSE OF THE MONEY-BEE 675 



transparent glass slide of the same dimensions, upon the 

 center of which a small quantity of honey was placed. 

 These slides are used for mounting microscopic objects, 

 and may be obtained of any dealer in optical instruments 

 for a trifling sum. 



After the bee had made a number of visits to the blue 

 paper, a red slide of the same dimensions, and prepared 

 as described above, was placed six inches to the right of 

 it. An equal quantity of honey was also placed upon the 

 center of this slide. When the bee returned from the 

 hive it alighted on the blue slide, which still remained in 

 its original position. 



On the departure of the bee for the hive the slides were 

 transposed, i. e., the red put in the place of the blue and 

 the blue where the red had been. When the bee returned, 

 and no longer found the blue paper in its usual position, 

 it flew back and forth, examining both slides, paused for 

 a second or two on the red, then resumed its flight, but 

 finally settled on the blue. A little later it flew up into 

 the air, but soon returned to the blue; then it flew across 

 to the red, where it remained for the rest of its visit. The 

 change in the position of the blue, and the discovery of a 

 differently colored slide also bearing honey, evidently 

 disturbed the bee; and its frequent flights showed that 

 it was endeavoring to orient itself to these new condi- 

 tions. As will now appear it did not find it necessary to 

 repeat this course of reeonnoitering. 



While the bee was away I transposed the slides for a 

 second time, the distance apart being as before— six 

 inches. . The bee returned directly to the blue. Twice it 

 left the blue for a few moments, but each time returned 

 to it. 



When the bee left for the hive, I again transposed the 

 slides ; the bee returned to the blue. The bee left for the 

 hive, and I transposed the slides. It returned to the blue. 



While the bee was away I transposed the slides for the 

 fifth time. The bee returned to the blue. Then it left the 



