374 SIB J. LTJBBOCK ON ANTS, BEES, AND WASPS. 



layer of similar tMckness (1 inch) of water coloured light blue by 

 ammonio-sulphate of copper. 



I therefore took again the piece of violet glass, over which I 

 placed a flat-sided bottle, about 1 inch thick, containing a liglit- 

 blue solution of ammonio-sulphate of copper ; and, in contrast with 

 it, I used the same coloured glasses as before. 



Pirst, I took the red glass. 



Observation 1. Some of the ants were under each, but most under 

 the red glass. 

 „ 2. All under the red glass. 



„ 3. Almost all under the red. 



4. 



I now took the green glass. 



Observation 1. Almost all were under the green. 



2. All were under the green. 



3. Two thirds were under the green. 



4. All 



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These experiments were made on a gloomy day ; so I repeated 

 them on a bright one, when the contrast was more marked. 



Observation 7. All were under the green glass. 



except two or three. 

 10. 

 „ 11. 

 » 12. 



I now took the dark-yellow glass. 



Observation 1. All were under the yellow glass. 

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4. 

 I now took the light-yellow glass. 



Observation 1. They were all under the light-yellow glass. 



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4. 



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