( 100 ) 



protuberant part, ■\^'hich, upon examination by the microfcope, 1 

 found to be wings. I alfo opened the bodies of feveral of the flies, 

 and in them I found young ones of the fame form, and in like nxnn- 

 bers, as the other Animalcules, all which plainly proved to me that 

 thefe Animalcules, commonly called goofeberry lice, are changed 

 into flies. 



As I was aflured that the Animalcules which had been bred in my 

 houfe, and were now fourteen days old, had grown to their full fize, 

 I opened three of them, and from the body of one of them I took 

 about thirty young ones, of different lizes, from another forty-nine, 

 and from the third fixty. At this very great increafe I was afloniflaed, 

 and was deflrous to examine all the goofeberry and other trees in my 

 garden, in order to extirpate thefe noxious animals as much as pof- 

 fible; and the rather, becaule when changed into flies, they can fly 

 into other trees, and fo infe<5t the whole. But though we may clear 

 our gardens ever fo much, they will be ftill liable to be ipfefted fron^ 

 neighbouring ones. 



' Some of thefe Animalcules, whofe change I judged was near, I 

 put into a glafs, in order, if pofllble, to obfcrve the nature of fuch 

 change ; and, after a day or two, I faw one of them put otF its flcin 

 and aflume a new form : its wings, which before had been folded up 

 very clofe, it expanded by degrees, fliaking them flightly, and then 

 they appeared as fl:raight and regularly placed as if they had never 

 been folded up, and the fame I obferved in others. 



This kind of propagation appeared to me more wonderful than 

 any I had before oblerved ; if we confider that fuch minute Animal- 

 cules, as thofe we are now confidering, fliall, within thirteen days 

 after they are produced from the parent, breed within them fixty 

 young ones, many of which can be feen to be completely formed ; 

 and moreover that thefe Animalcules, after iflliing from their parent, 

 fliall, in their growth, many times change their Ikins, produce 

 a number of young, and lallly be changed into flying animals which 

 pontiaue to bring forth young; this niull appear wpnderful, and be 



