THE PEAR. 



299 



them in their bodies, just as the Ichneumon-fly 

 lays its eggs in the larvae of the Cynips quercus- 

 folii (page 42). In either case the remedy is the 

 same. If a sharp frost sets in and destroys the 

 blossom, these insects do not abound for some 

 years. 



A parasitic fungus {CEcidium cancellatum) 

 sometimes attacks the leaves of the Pear and 



(ECIDIUIM CANCELLATUM. 



commits great ravages. It first appears in the 

 form of bunches of minute hairs on the veins of 

 the leaves, always on the under side, and accom- 

 panied by a dingy-red spot above. "When full 

 grown, each spot consists of a number of bag- 

 like excrescences, a quarter of an inch long, filled 

 with seeds. Every leaf which is attacked dies ; 

 and, as the parasite when it does appear is very 



