198 



EXPEKIMENTS WITH SPECTRUM. 



Obs. 

 4. 



5. 



6. 



7 



8. 



9. 

 10. 

 11. 

 12. 

 13. 

 14. 

 15. 

 16. 

 17. 

 18. 

 19. 



Queen went under yellow glass o | P^P=« ^^re taken j under 

 •' " I under vellow I Dorcelai 



porcelain 



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 if, 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 larvse, to which they obtained access over a 

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



