358 C. H. TURNER 



their flight they would stop in both light and shadow. At 

 12:03 p. m. two were roaming afoot, the majority were restless, 

 but none were flying. 



Experiment 15. At 12:14 the light was turned out. 



Soon all the wasps became quiet. 



Experiment 16. At 12:16 p. m. a pyramid of ruby light was 

 passed through the cage. 



Up to 12:25 p. m., a lapse of nine minutes, all of the wasps 

 remained quiet. 



Experiment 17. At 12:25 p. m. a pyramid of white light was 

 projected through the cage. 



The light impinged on four wasps. At 1 2 \2 7 a wasp resting 

 on the lighted patch on the ceiling began to walk about through 

 both light and shadow. At 12:28 p. m. several were making 

 random flights about the cage or hovering before the sides. 

 Two minutes later nine were on the wing. 



Experiment 18. At 12:30 p. m. a pyramid of ruby light was 

 passed through the cage. 



Immediately the wasps became quiet. At 12:32 p. m. a few 

 walked about and one flew from the top of a mud cell, across 

 the ruby light, to the opposite side of the cage. At 12 ^8 p. m. 

 all were quiet again. 



Experiment 19. At 12:39 p. m. a pyramid of white light was 

 passed through the cage. 



In less than a minute five were flying, at random, about the 

 cage. 



Experiment 20. A pyramid of blue light was passed through the 

 cage. 



The wasps continued to fly. 



Experiment 21. At 12:46 p. m. a beam of ruby light was pro- 

 jected through the cage. 



Soon all of the wasps became quiet. 



Experiment 22. At 12:48 p. m. a pyramid of blue light was 

 passed through the cage. 



At once one began to hum; and, in less than a minute, two 

 were on the wing. 



Experiment 23. At 12:51 p. m. the light was put out. 



The flying ceased at once, a few wasps continued to walk 

 about the cage. 



