A WOOLLY FLOCK 237 



Harris, is so buoyant as to enable the insect to be 

 borne upon the breeze from tree to tree. To 

 this resource he attributes the spread of the wing- 

 less apple-lice species. But it would take a stiff 

 breeze thus to waft the body of our plump dweller 

 on the alder, unless, indeed, in his younger days. 



