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of a dead one, on which it had been feeding, and placed it on a 

 living maggot, into which it immediately plunged its mouth, and, 

 notw'ithllanding all the eiforts the other made, by extending, con- 

 tracting, and twilling its body, to fliake it off, it Hill remained fixed 

 to it. One of thefe voracious maggots, when fully grown, appeared 

 no larger, to the naked eye, than is fhcwn at fig. 11. 



I caufed a drawing to be made, from the microfcope, of one of 

 the maggots I have been defer ibing, when changed into an aurelia 

 or cryfalis. Fig. 15, ABCDEF, reprefents this cry falls, which, 

 in the evening was a maggot, and, the next morning, was changed 

 to 'the figure here reprefented, and, in its change, had put otJ 

 an exceeding thin pellicle ; and in like manner as the body of it, 

 when a maggot, was compofed of many parts like rings, fo, when 

 a cryfalis, it retained the fame annular or infeded form. In this 

 creature, not only the feet, but every fingle joint in them, might 

 plainly be feen. 



At the letters G C and D G, are fliewn the two horns, and though 

 thefe were inclofed in the fame thin membrane with the body, }'et 

 every joint in them could very plainly be feen, and they were fully 

 formed, and distinct from the bodv. 



This maggot before, and for fome time after, its change, was of a 

 perfect white, but, after fome days, the eyes, wliich may be feen at 

 B and E, and each of them containing many optical organs, assumed 

 a dark colour, inclining to a blue. 



I had many of thefe maggots, and I watched them very narrowly, 

 to difcover in what manner their transformation from a rpaggot to 

 a cryfalis was performed ; but the change, when it took place, was 

 made in fo fliort a time that I never could get a fight ot it. 



Vol. IL 



