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C. H. TIKNKll 



lighted patch seven inches wide and six high and on the remote 

 side of the cage a similar patch 10 inches wide and eight high. 

 A portion of the roof was also lighted. 



No matter how actively the wasps might be flying or walking, 

 when the light from the lantern was shut off they almost imme- 

 diately became inactive. When the light was turned on, those 

 wasps upon which it impinged immediately became active. 

 Some walked and others flew at random about the cage. At 

 intervals those flying would alight upon some portion of the 

 cage. The positions of the wasps at stated intervals is given 

 in the following table. 



Experiment 5, June 14th, 1911, 16 to 25 wasps involved. 



In this series of experiments the cage containing the wasps 

 was placed in a room of twilight darkness and, at intervals, 

 pyramids of colored light were projected through the cage, by 

 means of an electric lantern. The sizes and distribution of the 

 light patches were the same as in series III. 



Experiment 6. After a beam of white light had been passing 

 through the cage for seven minutes, at 1:22 p. m., a piece of cobalt 

 glass was placed before the lens of the lantern. 



The wasps that had been flying actively about the cage sud- 

 denly became inactive. 



Experiment 7. At 1:37 p. m. a pyramid of white light was 

 passed through the cage used in experiment 6. 



A 1 140 p. m. a wasp began to fly and in about a minute several 

 were flying about at random. 



