214 EXPERIMENTS WITH 



effect placing the bisulphide of carbon on the violet 

 would have. 



First, I placed side by side, as usual, a piece of 

 green glass and the violet glass covered with bisulphide 

 of carbon : — 



1st exp. Half of the ants were under each. 



2nd „ They were under the violet glass and 



bisulphide. 

 "^i^tl ,, „ „ „ 



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



and bisulphide, 

 ^tn. „ „ „ „ 



Next, I tried pale-yellow glass. 

 1st 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. 



J then took the dark-yellow glass. 



1 st 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. 



8rd „ „ „ yellow glass. 



4th „ „ „ violet glass 



and bisul])hide. 



5th „ About half under each. 



