204 EXPERIMENTS WITH ELECTRIC LIGHT. 
hour they were all cleared away and carried into the dark 
space beyond the red. We then turned the nest round 
so that the part occupied by the pupe again came to be 
in the violet and ultra-violet. The light chanced to be 
so arranged that along one side of the nest was a line of 
shadow; and into this the pupz were carried, all those 
in the ultra-violet being moved. We then shifted the 
nest a little, so that the violet and ultra-violet fell on 
some of the pupe. These were then all carried into 
the dark, the ones in the ultra-violet being moved first. 
In these experiments with the vertical incidence 
there was less diffused light, and the pup were in no 
case carried into the red or yellow. 
Experiment 9.—I arranged the light and the ants 
as before, placing the pupz in the ultra-violet, some 
being distinctly beyond the bright thalline band. The 
ants at once began to remove them. At first many 
were deposited in the violet, some, however, being at 
once carried into the dark beyond.the red. When all 
had been removed from the. ultra-violet, they directed 
their attention to those in the violet, some being carried, 
as before, into the dark, some into the red and yellow. 
Again, when those in the violet had all been removed, 
they began on the pupe in the red and yellow, and 
carried them also into the dark. This took nearly half 
an hour. As I had arranged the pupe so that it might 
be said that they were awkwardly placed, we then 
turned the nest round, leaving the pup otherwise as 
they had been arranged by the ants; but the result of 
