374 



REACTIONS OF DAPHNIA PULEX TO LIGHT AND HEAT. 



Table IV. 



EXPERIMENTS TO TEST THE INFLUENCE OP HEAT UPON THE MOVEMENTS OF DAPHNIA. 



Heated Surface 5 cm. from + End of Trough. 



Temperature of Water at Beginning of Experiments 21° C. for all Regions of Trough. 



Temperature of Water at End of Experiments 28° C. at + End of Trough, 25° C. at - End. 



Period 3 min. Dec. 12, 1901, 7.45 p.m. 



Movement for series —.475 (i.e., .475 of a space toward the — end, away from heater). 



Table V. 



CHECK EXPERIMENTS. 



Period 3 min. Dec. 13, 1901; 8 p.m. 



EXPERIMENTS TO TEST INFLUENCE OF HEAT WHEN HEATED SURFACE WAS 20 CM. FROM + END OF TROUGH. 



Temperature of Water at Beginning of Experiments 22° C. 

 Temperature of Water at End of Experiments 26° C. at + End of Trough, 25° at - End. 



Experiment 1 

 2 

 3 

 4 

 5 

 6 

 7 

 8 

 9 

 " 10 



0.000 

 +0.375 

 -0.500 

 +0.125 

 -0.125 

 -0.625 

 -0.250 

 +0.875 

 -0.375 

 -0.875 



Movement for series -0.150. 



