214 EXPERIMENTS WITH 



eflfect placing the bisulphide of carbon on the violet 

 would have. 



P'irst, I placed side by side, as usual, a piece of 

 green glass and the violet glass covered with bisulphide 

 of carbon: — 



1st exp. The ants were equally divided. 

 2nd „ They were under the violet glass and 

 bisulphide. 



^^^ ii j> » )j 



4th exp. Most of them were under the violet glass 



and bisulphide. 

 otn „ „ „ „ 



Next, I tried pale-yellow glass. 

 Ist obs. The ants were almost all under the violet 



glass and bisulphide. 

 2nd „ About three-quarters were „ „ 

 3rd „ They were all „ «, 



4th „ About half were under each. 



I then took the dark-yellow glass. 



Ist obs. About half the ants were under the yellow 

 glass and half under the violet glass and 

 bisulphide. 



2nd „ Most of them were under the violet glass 

 and bisulphide. 



3rd „ „ „ yellow glass. 



4th „ „ „ violet glass 



and bisulphide. 



5th „ Equally divided. 



