1C8 ' EXPERIMENTS WITH SPECTEUM. 



Ota, 



4. Queen went under yellow glass 5^^ 5 



6. porcelain 3 8 



6. \ yellow glass 8 3 



7. porcelain 6 5 



8. 7 



9. 10 



10. yellow glass 5 5 



11. porcelain 8 2 



12. ,,3 ,,7 



13. yellow glass 10 ,, 



14. porcelain 10 



15. yellow glass 10 



16. 7 3 



17. 10 



18. porcelain 1 9 



19. 10 



98 92 



The porcelain and yellow glass seemed, therefore, 

 to affect the ants almost equally. 



I then put two ants on a paper bridge, the ends 

 supported by pins, the bases of which were in water. 

 The ants wandered backwards and forwards, endea- 

 vouring to escape. I then placed the bridge in the 

 dark and threw the spectrum on it, so that succes- 

 sively the red, yellow, green, blue, and violet fell on the 

 bridge. 



The ants, however, walked backwards and forwards 

 without (perhaps from excitement) taking any notice of 

 the colour. 



I then allowed some ants (Lasius niger) to find 

 some larvae, to which they obtained access over a 

 narrow paper bridge. When they had got used to it, 



