MOVEMENTS OF DAPHNIA 



243 



Exp. 14 



Effect of temperature on geotaxis 



March 19, 8 A.M., 10 Daphnia pulex kept 14_ hours in darkness placed in a 29 



ss. Tern- 



Exp. 15 



Effect on geotaxis of change in temperature 



February 26, 15 Daphnia pulex 15 hours in darkroom exposed to horizontal 

 light from an 80 watt Edison lamp at 2 meters placed in a 29 cm. high jar marked 

 off into five divisions. Experiment in same light. 



