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centre of their membranes, juft as if one were to fee a fpliere or 

 globe revolving upon its axis. This uncommonly pleafingfpedlacle 

 ^\as enjoycci by myfelf, my daughter, and the Engraver for three 

 wliole hours, and we thought it one of the moH delightful that could 

 be exhibited. 



Fig, 15. A B C D E exhibits fix of thefe unborn Miifcles inclofed 

 in their refpective membranes ; they were drawn by the Engraver in 

 the moft accurate manner he could, while they were in motion. Of 

 thefe, I computed that each parent Mufcle contained fome thoufands. 



I had at the fame time fome unborn Oyflers before a microfcope 

 which I had taken out of the parent Oyfter five weeks before, and 

 as they ftill appeared perfetSf in fliape, I caufed a drawing to be made 

 of them alfo, and this is lliewn at fig. 16, F G H I. \n fome of 

 thefe the openings of their fhells were plainly to be dilcerncd. 



Thefe young Oyfters bore the mofi; exad: refemblance to full 

 grown ones, though they were fo minute that one hundred of them 

 laid together would not equal an inch in length, and I have computed 

 that each parent Oyfter contained three or four tiioufand of them. 



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