198 EXPERBIENTS WITH SPECTEUM. 



Obs. 



4. Queen went under yellow glass 5 1 P^P^ were tal<en , under 

 J S-. I under yellow I porcelain 



8 



>i 3 „ 



5 



7 



10 



>» 5 » 



2 



7 







10 







3 







9 



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 {Lasnts niger) to find 

 some larvse, to which they obtained access over a 

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



