SIR J. LUBBOCK ON ANTS, BEES, AND WASPS. 375 



These experiments seem to demonstrate that in the previous 

 series the ants were really influenced by some property inherent 

 in the bisulphide of carbon, and which affected their eyes, though 

 it was insensible to ours. 



I then thought it would be interesting to use, instead of the 

 bisulphide, a solution of sulphate of quinine (i dr. to 4 ounces), 

 which differs from it in many points, but agrees in cutting off the 

 ultra-violet rays. I used, as before, a layer about an inch thick, 

 which I placed over violet glass, and then placed by its side the 

 same coloured glasses as before. 



First, I took the red glass. 

 Obs. 1. About half the ants were under each. 

 „ 2. Most of them were under the red glass. 

 „ 3. About half under each ; rather more under the violet glass 



and sulphate of quinine than under the red glass. 

 „ 4. ditto ditto ditto. 



I now took the dark-yellow glass instead of the red. 

 Obs. 1. Most of the ants were under the violet glass and sulphate 



of quinine. 



yellow glass. 



„ 6. All of the ants were under the violet glass and sulphate 

 of quinine. 



„ 7. About half under each. 



„ 8. Rather more under the violet glass and sulphate of qui- 

 nine than under the yellow glass. 



I then took the light-yellow glass instead of the dark. 



Obs. 1. The ants were all under the violet glass and sulphate of 

 quinine. 



„ 2. Rather more than half under the yellow glass. 



„ 3. Almost all under the violet glass and sulphate of quinine. 



„ 4- All 



I then took the green glass instead of the yellow. 

 Obs. 1. They were under the violet glass and sulphate of quinine. 



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„ 3. About half under each. 



,, 4. About three quarters under the green glass. 



„ 5. Almost all under the violet glass and sulphate of quinine. 



5> 



2. 



All 



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if 



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