10 
ANIMAL INTELLIGENCE. 
distant. He poured down their burrows a pint of common 
brown carbolic acid, mixed with four buckets of water. 
The marauding parties were at once drawn off from the 
garden to meet the danger at home, and the whole formi- 
carium was disorganised, the ants running up and down 
again in the utmost perplexity. Next day he found them 
busily employed bringing up the ant-food from the old 
burrows, and carrying it to newly formed ones a few yards 
distant. These, however, turned out to be only intended 
as temporary repositories ; for in a few days both the old 
and the new burrows were entirely deserted, so that he 
supposed all the ants to have died. Subsequently, how- 
ever, he found that they had migrated to a new site, about 
two hundred yards from the old one, and there established 
themselves in a new nest. Twelve months later the ants 
again invaded his garden, and again he treated them to a 
strong dose of carbolic acid. The. ants, as on the previous 
occasion, were at once withdrawn from the garden, and 
two days afterwards he found 6 all the survivors at work on 
one track that led directly to the old nest of the year before, 
w T here they were busily employed in making fresh exca- 
vations. Many w r ere bringing along pieces of ant-food 5 
from the nest most recently deluged with carbolic acid to 
that which had been similarly deluged a year before, and 
from which all the carbolic acid had long ago disappeared. 
4 Others carried the undeveloped white pupae and larvae. 
It was a wholesale and entire migration;’ and the next day 
the nest down which he had last poured the carbolic acid 
w^as entirely deserted. Mr. Belt adds : ‘ I afterwards found 
that when much disturbed, and many of the ants destroyed, 
the survivors migrate to a new locality. I do not doubt 
that some of the leading minds in this formicarium recol- 
lected the nest of the year before, and directed the 
migration to it.’ 
Now, I do not insist that the facts necessarily point to 
this conclusion ; for it may have been that the leaders of 
the migration simply stumbled upon the old and vacant 
nest by accident, and finding it already prepared as a nest, 
forthwith proceeded to transfer the food and pupae to it. 
Still, as the two nests were separated from one another by 
