On a Maggot ivhich is found in the hlojfoms of fruit trees, particu- 

 larly apples ; the Fly from whence it is produced particidarly de- 

 scribed ; tvith the Author s reasoning on the production of minute 

 "flying animals. 



Although it has always been my firm opinion, that no ani- 

 mal, however minute, is produced any otherwife than by courfe 

 of generation, neverthelels, I determined to profecute my inquiries 

 in the examination of thofe minute FHes and other infcAs, which 

 are found on the leaves of fruit-trees and plants in gardens. 



Having heard frequent mention made of a certain black Fly, 

 which was faid to be very noxious to the bloflbms of fruit trees, I 

 examined the bloflbms on the fruit trees in my garden, and parti- 

 cularly the apple-trees, and found that many of the flowers did not 

 blow out fully, nor were they of a white or pink colour, but ap- 

 peared fhrivelled and of a kind of rulty red. 



Upon opening thefe bloflbms, I found within the leaves of mod 

 of them a Maggot of a pale yellow colour, and in fome of them a 

 cryfalis, which I concluded had been changed by tranfmutation, 

 from one of thofe Maggots ; and as I, at the fame time, ob- 

 ferved many black Flies on the leaves and flowers of thofe fruit 

 trees, I concurred in the common opinion refpeding them, and 

 concluded that thofe Flies had laid an egg on each flower, from 

 which Maggots had been hatched, and that they, being changed 

 into cryfales, did at length produce the fame fpecies of black Fly. 



At the fame time, I was of opinion, that if thefe Maggots were 

 not depoflted within the bloflbms before they were full blown, few 

 of them would be preferved alive, becaufe this Maggot is not in- 

 clofed in a web or cafe, as we obfen-e in moll other cryfales, and 



