238 



LEE RAYMOND DICE 



Exp. 8 



Effect of change of light intensity on geotaxis 



January 20, 2.30 P.M., 11 Daphnia pnlex from diffuse light of laboratory placed 

 in a 29 cm. high jar marked off into five divisions. Top sealed. For weak light 

 used horizontal light from a 40 watt Edison lamp at 2 meters, and for strong light 

 used a 100 watt Mazda lamp at a horizontal distance of 20 cm. 



