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. 
3rd_,, ” ” ” 
4th exp. Most of them were under the violet glass 
and bisulphide. 
5th 2” ry) ” ” 
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 5 3s 
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 ,, 55 yellow glass. 
4th ,, mF 35 violet glass 
and bisulphide. 
5th ,, About half under each. 
