19 
with the same zeal with which it was evidently commenced. We 
have met with no report ever rendered by them. (Carey’s Mu- 
seum, vol. xi., p. 285.) 
At this time, as we infer from a clause in the circular just al- 
luded to, and also from some passages in Dr. Mitchell’s address 
before the New York society of agriculture; (Transactions, vol. 
i., p. 32,) the insect was becoming so rare in all the more densely 
settled parts of the middle states, which had been first overspread 
by it, that it was the common opinion that it would soon vanish 
from the country entirely. Notices of it in the magazines and 
newspapers become more rare, and it was evidently ceasing to be re- 
garded with that intense solicitude which it had hitherto excited. 
It was, however, with unabated vigor, continuing its progress 
southward. A letter from Prospect Hill, Delaware, dated June 
12th, 1792, (Carey’s Museum, vol. xi., p- 301,) states that the 
fly arrived there “ in prodigious clouds,” about the middle of the 
preceding September. It describes the place where the eggs were 
deposited on the young wheat, the growth of the worm, and the 
perishing of all the plants, except those growing upon a rich soil, 
and adds further testimony in favor of the Underhill wheat. 
In 1797, Dr. Isaac Chapman, of Bucks county, Pa., prepared 
one of the best accounts of this species that has ever appeared, 
containing the details of his own careful observations upon the 
insect and the time of its appearance in its different stages. These 
observations lead him to recommend as the most certain safe- 
guards against the fall attack, late sowing, and against the spring 
attack, a quick vigorous growth, to be obtained by procuring 
southern seed and sowing it on a rich, elevated and dry soil. His 
paper is published in the fifth volume of the Memoirs of the Phila- 
delphia Society for Promoting Agriculture, a volume which we 
regret having been unable to find in either of the largest libraries 
of this state. We are therefore obliged to depend for its contents 
upon second hand accounts. Dr. C. states that the fly was this 
year found upon the west side of the Alleghany mountains. 
The eighth volume of the Encyclopedia Britannica, published 
this year, gives (pages 489-495) an extended article under the 
head Hessian Fly, consisting chiefly of a summary of the several 
