148 SISTER ANTS. RECOGNISED 
1879, divided it into halves, which I will call A and B, 
so that there were approximately the same number of 
ants with a queen in each division. At this season, 
of course, the nest contained neither young nor even 
eggs. During April both queens began to lay eggs. 
On July 20 I took a number of pupee from each division 
and placed each lot in a separate glass, with two ants 
from the same division. On August 30 I took four 
ants from the pupe bred in B, and one from those in A 
(which were not quite so forward), and after marking 
them as usual with paint, put the B ants into nest 
A, and the A ant into nest B. ‘They were received 
amicably and soon cleaned. Two, indeed, were once 
attacked for a few moments, but soon released. On 
the other hand, I put two strangers into nest A, but 
they were at once driven out. For facility of observa- 
tion I placed each nest in a closed box. On the 31st 
I carefully examined the nests and also the boxes in 
which I placed them. I could only distinguish one 
of the marked ants, but there were no dead ants either 
in the nests or boxes. 
I carefully examined the box in the same way for 
several successive mornings, but there was no dead 
ant. If there had been I must have found the body, 
and I am sure, therefore, that these ants were not 
attacked. 
Again, on August 31 I put two more of the ants 
which had emerged from the pupz taken out of nest 
B, and nursed by ants from that nest, into nest A at 
