RELATION BETWEEN ANTS. 157 
base of a wall, which she can follow with- 
out hesitation. Should she fall in with 
any of her associates from the nest they 
put her in the right way by the contact 
of their antennee.— This method of guid- 
ing their companions is not practised by 
every species of ants; for some employ, 
under certain circumstances, a process 
more mechanical and less rapid than 
the fugitive signs of which the an- 
tennz are the organs. ‘This is the sub- 
ject upon which we shall now touch in 
speaking of their migrations. 
3. The Migrations of the Fallow Anis. 
AnTs are now and then induced to 
change theirresidence. Should it be too 
much in the shade, too humid, too ex- 
posed to the attacks of passengers, or 
too contiguous to an enemy’s quarters, 
thus rendering it unsafe as well as un- 
pleasant, they leave it to lay the founda- 
tion of another in some other place. 
