GALL-FLIES. 



337 



substance. The structure is somewliat spongy, but fibrous ; 

 and externall}^ the bark is smoother than that of the branch 

 upon which it grows. (J. R.) 



Woody Gall on a Willow branch, drawn from a specimen. 



The currant-galls (as the French call them) of the oak 

 are exactly similar, when formed on the leaves, to those 

 which we have first described as produced on the leaves of 

 the willow and other trees. But the name of currant-gall 



Currant Gall of the catkins of the Oalj, produced by Cynips quercus pedunculi? 



seems still more appropriate to an excrescence which grows 

 on the catkins of the oak, giving them very much the 

 appearance of a straggling branch of currants or bird- 



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