xx Contents of the Chapters, 
Remarks on a Micropaeter to he applied to 
Double Compound Microfcopes. By Mar¬ 
tin Folkes, EJq; F. R. S . p. 426 
A Defcription of Mr. Leeuwenhoek 's Micros 
fcopes, 434 
Biredtions for making the Reprefentation or 
Ficiure of any Medal or Coin, 436 
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E M PLOY- 
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