( m ) 



parent, I not only favv many veflels, but I could difcover many cf 

 the eyes, or optical organs, w ith which this creature is provided, all 

 which were a plcafant IpecHiacle to behold. 



Hitherto 1 had been of opinion that thele Animalcides fed only on 

 the veins or veflels of the leaves, and that their breaking or biting 

 them caufed the leaves to Contract, and under which contra('l;ed 

 leaves the animals llieltered themfclves from the heat of the fun ; 

 but now I faw that they, for the moll part^ fed on the very fmall 

 buds and alio on the Ihdks of the leaves, the velTels of which being 

 wounded caufed the leaVes to contrail in their growth, and the nou- 

 rilhment from the young flioots being, in a great meaftire, taken 

 away, the flioots grow knobbed and crooked. 



Upon recoUeding that, in the former fummer, I had feeri on my 

 plums and apple trees a great number of flics which, as I thought, 

 had fo imJDeded their growth that not only the apples wefe very fmall, 

 but alfo the young flioots were very defective, I now determined to 

 examine into the true caufe of that appearance. 



I could not, in my fearch, difcover any eggs of thofe flies in my 

 apples, peaches, and plum trees, but I now faw all the young flioots 

 bf one of my goofeberry trees to be uncommonly contracted, and oft 

 it I not only faw a great number of thofe Animalcules I have de- 

 fcribcd, which breed their young within them, but alio many black 

 flies, whole bodies were not larger than the bodies of those Animal- 

 cules. I therefore pulled up the tree and threw it into the water, 

 concluding it impoflible to extirpate all the Animalcules and lave the 

 tree's growth, having firll cut ofi' two branches of it for further ex- 

 amination. 



Thefe flies have four wings, the two largefl: of which are twice 

 the fize of their bodies ; I could not, at firll, think they were pro- 

 duced from the other Animalcules, but, upon examining them by 

 the microfcope, I found the bodies of both of them to be veiy flnii- 

 lar, and, after feveral repeated obfervations, I law that the firfl: men- 

 tioued Animalcules had, on each lide of their bodies, a long >n bite 



