220 The Chimney Swift 
other birds. On the contrary, the home of the swift 
is rather rough within, while the entire surface, inside 
and out, has a_ glistening appearance due to the 
abundance of saliva which is used, not only at the 
NEST AND YOUNG OF THE CHIMNEY SWIFT 
intersection of the twigs, but also scattered some- 
what promiscuously over them. The saliva when dry 
is a hard glue-like substance, possessing considerable 
strength, but when moistened by continued rains it 
