370 SIB J. ltjbbocb: on akt3, bees, and wasps. 



of bisulphide of carbon, moving them from time to time as 

 before. 



At 9.45 the ants were all under the bisulphide : I then changed 

 the position. 

 10.15 ditto ditto ditto. 



10.45 ditto ditto ditto. 



11.15 ditto ditto ditto. 



I then reduced the thickness of the layer of bisulphide to 

 ■^ of an inch. 



At 1.30 the ants were all under the bisulphide : I then changed 

 the position. 



2 ditto ditto ditto. 

 2.30 ditto ditto ditto. 



3 ditto ditto ditto. 



Then thinking that possibly it might make a difference, the 

 one shelter being a plate of glass and the other a liquid, I 

 tried two similar bottles, one containing water and the other bi- 

 sulphide of carbon ; but in eve'Ty case the ants went under the 

 bisulphide of carbon. On the other hand, when I used a solu- 

 tion of ammonio-sulphate of copper so deep in colour that the 

 ants were only just visible through it, the ants went under the 

 coloured liquid. 



Oct. 10. I uncovered the nest at 7 a.m., giving the ants an option 

 between the bisulphide and a solution of ammonio-sulphate of 

 copper. 



At 7.30 the ants were all under the solution of ammonio-sS3phate 

 of copper. Changed the places. 



8 ditto ditto ditto. 

 8.15 ditto ditto ditto. 



I then replaced the solution of sulphate of copper by one of 

 carmine so deep that the ants could only just be seen through it. 



At 8.30 they were under the carmine. I shifted the carmine and 

 bisulphide. 

 8.45 ditto ditto ditto. 



9 ditto ditto ditto. 

 9.15 ditto ditto ditto. 

 9.30 ditto ditto ditto. 



I now took a bright-green solution of chlorate of copper : — 



