212 EXPEKIMEKTS WITH 



In this case, therefore, though without the layer of 

 bisulphide the violet glass would always have been 

 avoided, the result of placing the bisulphide over the 

 violet glass was that the ants did not care much 

 whether they were under the violet glass or under the 

 bichromate of potash. 



I then took the same solution of carmine which T 

 Qad already used. 



10. The ants were under the carmine. 

 10.15 



10.30 „ most under the carmine, but 



some under the violet. 

 10.45 „ under the carmine. 



11. „ most under the carmine, but 



some under the violet. 



Here, then, again the bisulphide made a distinct 

 difference, though not so much so as with the bichro- 

 mate of potash. 



I then took the solution of chlorate of copper 

 iuready used. 



1 About half the an^s were under each. 



1.30. The greater number were under the violet 

 glass and bisulphide. 



