OAK SPANGLES. 



149 



This is only one out of many forms of gall that 

 may be found on the oak, where sometimes the 

 leaf is attached, sometimes the catkin, and some- 

 times the young bud. Another form of that on 



OAK SPANGLE. 



the leaf consists of very small circular discs fixed 

 to the under part by their central points. The 

 outer side of the disc is red and hairy, the inner 

 side smooth. Each disc contains a single insect, 

 which remains in it long after the leaves have 



