150 



INSECT MANUFACTURES. 



fallen to the ground. The common name of this 

 curious excrescence is " oak-spangle." 



Still more singular is the gall found in the 

 catkins of the oak. The flies deposit their eggs in 

 the stalk of the stamen-bearing flowers, which in 

 consequence become adorned with what appear to 



CURRANT GALLS. 



be straggling bunches of currants or bird-cherries. 

 Placed at short distances from each other on the 

 thread-like stem, these excrescences so much re- 



