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removed from their nest as pupm, attended by friends and restored to their 
own nest, were all amicably received. What is still more remarkable, of 
twenty-two ants belonging to Formica fuscct, removed as pupse, attended by 
strangers and returned to their own nest, twenty were amicably received. 
As regards one, Sir John was doubtful ; the last was crippled in coming out 
of the pupse case, and to this, perhaps, her unfriendly reception may have 
been due. Of the same number of Lasius nic/er developed in the same man- 
ner from pupae tended by strangers belonging to the same species, and then 
returned into their own nest, seventeen were amicably received, three were 
attacked, and of about two Sir John felt doubtful. 
On the other hand, fifteen specimens belonging to the same species, 
removed as pupse, tended by strangers belonging to the same species, and 
then put into the strangers’ nest, were all attacked. 
The results may be tabulated as follows : — 
Pupae brought up by friends and 
replaced in their own nest. 
Pupse brought up by strangers. 
Put back in own Put in strangers’ 
nest. nest. 
Attacked . . 0 . 7* . .15 
Received amicably . 33 . .37 .0 
Sir John intends to make further experiments in this direction, but the 
above results seem very interesting. They appear to indicate that ants of 
the same nest do not recognise one another by any password. On the other 
hand, if ants are removed from the nest in the pupa state, tended by 
strangers, and then restored, some at least of their relatives are certainly 
puzzled, and in many cases doubt their claim to consanguinity. Strangers, 
under the same circumstances, would be immediately attacked ; these ants, 
on the contrary, were in every case — sometimes, however, after examination 
— amicably received by the majority of the colony, and it was often several 
hours before they came across one who did not recognise them. — Nature , 
February 20, 1879. 
Of about three of these Sir John did not feel sure. 
