( 2G0 ) 



deaths to be occafioned by this, that in touching them, fome of 

 thole minute vell'els might be injured, and many of the eggs de- 

 pending on them be broken off, and putrefying in the body, jnight 

 occalion death. At length, on the feventh of September, 1 had 

 only two Flies left alive, one of whicii had loit a \ving. Thefe 1 

 judged to be a male and a temale. 



On the ninth of September in the morning, I found one hun- 

 dred and forty-five eggs laid, as I judged, by one Fly : fojne of 

 thele eggs, with a piece of dried fleth, I put into a glafs and carried 

 in my pocket, the weather being cold, to fee in what fpace of time 

 maggots would be produced from thofe eggs, and I found fome of 

 them hatched the very fame day. The next morning all the others 

 were hatched, and I found that, in that one night's time, they 

 had all grown twice the fize of the eggs. 



I again put fome more eggs into a glafs, and carried them in my 

 pocket, and in five hours time they were all hatched, and in fevcn 

 hours more they were grown to twice their original fize, fo that I 

 concluded for certain, that the maggots which had been brought to 

 me on the piece of flelh taken from the gentlewoman's leg, had been 

 produced from eggs laid on it at the lafl drelhng, by fome Fly, and 

 that when brought to me, they had been hatched but a few hours. 



I caufed drawings to be made of the Maggot, the Grub, and the Fly, 

 I have here defcribed, becaufe thefe Flies are the largeft fort found 

 in our country. Plate XVIII. fg. 21, is the maggot when grown 

 to its full fize and five days old. Fig. 22, is the cryfalis, aurelia, 

 or grub into which the maggot was transformed, and at one end of 

 it appears the hole through which the Fly iflued. Fig. 23, is the Fly: 

 and unlefs 1 had been convinced by my own experience and infpec- 

 tion, it would have feemed incredible to me, that fo large a Fly 

 could proceed from fo tmall a grub ; but we muft confider, that the 

 wings, and alfo the hairs with which the Fly is covered, are placed 

 as clofe as pofilble to its body, while in its aurelia or cryfalis ttate; 

 but when it becomes a perfecl Fly, they feparate from the body. 



