

202 JOHN L. PRICER. 



arranged as in experiment I., and the disulphide cells were placed 

 over the clear plates. The ants immediately collected under the 

 red plates after the arc light was turned on. These plates were 

 then exchanged with the two blue plates, and twenty-five minutes 

 later the ants were again under the red plates. These plates 

 were then replaced by clear plates, and thirty minutes later all 

 ants were collected under the two orange and one of the green 

 plates. The orange plates were again exchanged with the blue, 

 and in twenty-five minutes the ants were under the two green and 

 one of the orange plates. The green plates were then removed 

 from the nest and thirty-five minutes later all ants were under the 

 two orange plates. These were then removed from the nest and 

 forty minutes later all ants were under the two disulphide cells. 

 The two disulphide cells were now placed over the blue plates 

 and in twenty-five minutes all ants were collected under them. 

 Next the cells were moved to the indigo plates and in thirty-five 

 minutes all ants were again under them. The cells were then 

 placed back on the clear plates and in thirty-five minutes the ants 

 were again under them. The red plates were then placed back 

 on the nest, and two hours later some of the ants were still under 

 the disulphide cells, although most of them had moved to the red 

 plates. 



These results indicate plainly that, when forced to choose 

 between light of different wave-lengths, these ants have a decided 

 preference for the red or longer rays and a decided dislike for the 

 ultraviolet rays. The last part of experiment III. also indicates 

 that they prefer the red rays to the blue and violet rays. In these 

 respects these ants seem to agree perfectly with the ones which 

 Lubbock experimented upon (" Ants, Bees and Wasps," pp. 21 1 

 to 217) and also with those of Miss Fielde (" Notes on An Ant," 

 Philadelphia Academy of Science, Vol. 54, pp. 614 to 625). 



Experiment IV. 



Twenty-five workers of C. fevrugineus were cooled until they 

 were inactive and then their eyes were carefully painted with a 

 mixture of liquid glue and lamp black. They were then placed 

 in a Fielde nest consisting of two rooms, four by four inches, 

 which were joined by a narrow passage-way. One room was 



