RELATION OF BURSARIA TO FOOD 



25 



TABLE 8 



Experiment V 



NaOH 



MOL. CONC. 



1/400. 

 1/600. 



1/800. 



1/1200 



1/1600 

 1/3200 

 1/6400 



NUMBER OF GRAINS EATEN BY EACH INDIVIDUAL 



All dead in 3 minutes 



All dead in 10 minutes 



Many dead at 15 minutes; none eaten at end 



of 20 minutes 



All alive and normal in shape at end of ex 



periment ; no grains of yolk eaten 



CONTROL IN CONDUCTIVITY WATER 



7 910 9 9 4 510:10 6 612 4 6 5 617 8 8 4 



TOTAL 

 NUMBER 

 GRAINS 





 











19 

 121 

 148 



155 



H CI 



1/400. . 



1/600. . 

 1/800. . 

 1/1200. 

 1/1600. 

 1/3200. 

 1/6400. 







32 



90 



90 



123 



130 



162 



137 



Experiments VI and VII. White light from the arc of an Edinger 

 apparatus was focused upon the stage so that a spot of light 1^ inches 

 in diameter, of a very high intensity, was obtained. The light was 

 filtered through a layer of water 1.5 cm. in thickness. An 8 cc. stender 

 dish containing thirty normal individuals was placed in the spot of 

 light and the usual quantity of yolk suspension added. A control was 

 kept in weak diffuse daylight. The animals were fed twenty minutes. 

 The following results show that continuous action of intense white 

 light on the animals does not have any effect upon the rate of feeding. 

 Two experiments with controls are given (tables 9 and 10). 



