198 EXPERIMENTS WITH SPECTRUM. 
Obs. 
4, Queen went under yellow glass 5 { eRe yaile aig 5 { P pia - 
5 i porcelain 3 * 8 ” 
6. My yellow glass 8 Fs 3 ” 
7 + porcelain 6 3 5 ” 
8. ” ” 0 ” 7 ” 
9. + a 0 » 10 ” 
10. a yellow glass 5 7 5 ” 
ll. PA porcelain 8 3 2 ” 
12. oy ” 3 ’ 7 ” 
13. 5 yellow glass 10 Py 0 
14. es porcelain 0 5 10 es 
15. a yellow glass 10 ae 0 $5 
16. ” ” 7 ” 3 ” 
17. ” ” 10 ” 0 oo 
18. s porcelain 1 5 9 e 
12. * Pe 0 i 10 is 
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) te find 
some larve, to which they obtained access over a 
narrow paper bridge. When they had got used to it, 
