usual efficacy, but that it would also prevent the 

 access of a new colony of the enemy. In this, 

 however, he was disappointed, for on examining 

 the same trees again, at the expiration of about 

 six weeks, he found that a new deposit had been 

 made, and that the young worms were then 

 devouring what their predecessors had left. This 

 fact exhibited the inefficacy of the practice of 

 laying bare the roots during the winter. " About 

 the close of July, many of these insects, having 

 assumed the winged state, soon after deposit 

 their eggs in peach-trees, just beneath the surface ; 

 first wounding the bark in different places, which, 

 on examination, appears to have been effected by 

 a blunt pointed instrument. They leave from 

 one to fifty, and in some instances, nearly three 

 hundred eggs in each tree, according to its size 

 and capacity to support the future progeny : these 

 soon appear, but it is difficult to detect them 

 until they have acquired a growth of two or 

 three weeks, when they are four or five lines in 

 length. From this period, their growth is accele- 

 rated or retarded in proportion to the quantity of 

 nourishment afforded. In general, however, the 

 pupae are formed early in October, in the midst 

 of a conglomeration of gum, fibrous and excre- 

 mentitious matter, and about the close of the 



PLATE XIX, 



