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would feed on the goofeberry tree ; I therefore took three 

 branches of this year's growth from a goofeberry tree, which I put 

 into a veflel full of water, and put on each of them a cherry tree 

 leaf, whereon were many of thofe Animalcules, judging, that as the 

 cherry leaves began to wither, they would leave them and remove 

 to the goofeberry leaves, which they accordingly did. But they did 

 not remain clofe to each other, as they had done on the cherry 

 leaves, where they had food clofe to them, but difperfed themfelves 

 among the goofeberry leaves, creeping up and down among the 

 branches, I then put two twigs of the cherry tree in the veflel clofe 

 to the goofeberry branches, and faw many of the Animalcules quit 

 the goofeberry and remove to the cherry branches ; thofe which 

 did not remove to the cherry branches, I found afterwards dead ; 

 others got down to the water and there perilhed. 



On the 23d of June, I was much furprifed to fee a great nuni- 

 ber of the Animalcules Hill remaining on the cherry branches, and 

 on the 20th, I faw fome of them changed into flies ; but what I 

 mofl; wondered at was, that fome of the Animalcules, which I 

 judged had lived through the whole winter, were not yet changed 

 into flies. 



I obferved, among other things, that as foon as one of thefe 

 Animalcules had put off its Ikin, and w^as changed into a fly, it 

 immediately began to move its wings, whereby they opened a little 

 from the fides of their bodies, to which they before were clofely 

 attached, and in the fpace of two minutes acquired their full fize ; 

 and, at this time, I thought I faw the parts of the wings not only 

 unfold, but alfo encreafe in fize. 



Moreover, I opened fome of the Animalcules which were 

 changed into flies, and took feveral young ones out of their bodies ; 

 thefe animals had alfo a piercer, which they thrufl; out of the or- 

 gan, fig. 28, 1 1, and which is there fliewn at I A: this is put off 

 with the ikin when they undergo their change. 



Cc 2 



