202 EXPERIMENTS WITH ELECTRIC LIGHT. 
rays were moved first, and were deposited, the larve in 
the violet, and the pupe in the red. 
Experiment 4.—Made the same experiment with 
another nest of L. niger. At the commencement the 
larvee and pupe were in the violet and ultra-violet 
portion, extending to double the distance from the 
visible end to the thalline band. The ants soon began. 
bringing the pupe to the red. Over part of the red I 
placed a piece of money. The pupz were cleared from 
the ultra-violet first. That the pupse were not put in 
the red for the sake of the red light was evident, 
because the space under the coin was even more 
crowded than the rest. The pups were heaped up in 
the dark as far as the thalline band of the other spec- 
trum. I then brought the second spectrum nearer to 
the first. The pupz which thus came to be in the 
thalline band were gradually moved into the dark. 
Experiment 5.—Tried the same with another nest 
of LZ. niger. The pupe were at first in the violet and 
ultra-violet about double as far as the thalline line, 
while most of the larve were in the green. The 
furthest part was cleared first; and they were again 
brought principally into the yellow, red, and dark. 
Again, I scattered them pretty equally, some being 
in the ultra-violet portion, as far as double the distance 
of the thalline from the violet; most, however, being 
in the violet and blue. 
The ants began by removing the pupe which were 
