170 



INSECT ARCHITECTURE. 



joins it, indeed, so completely round and round, that 

 it has somewhat the resemblance of an egg. Within 

 this green cell it lies secure, till the time arrives 

 when it is ready to burst its cerements, and trust to 

 the quickness of its wings for protection against its 

 enemies. 



Among the nests of caterpillars which roll up par- 

 cels of leaves, we know none so well contrived as 

 those which are found upon willows and a species 

 of osier. The long and narrow leaves of these 

 plants are naturally adapted to be adjusted pa- 

 rallel to each other; for this is the direction which 



Nest rf Willow-ltaf Roll. 



