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. The ants were equally divided. 

 2nd They were under th.e violet glass and 

 bisulphide. 



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

 and bisulphide. 



>, 



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. 



I then took the dark-yellow glass. 



1st 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. 



