TO THE 



READER. 



mPhy/ical and Mathematical Learn- 

 ing, being regifter'd in the Volu- 

 minous Journals of the Royal Socie- 

 ty, are amongft a multitude of 

 lefs ufefui Matters, fo Obfcurely 

 hid, that but very few inquifi- 

 tive Gentlemen ever fo much as 

 heard of them. 



The Defign therefore of the 

 enfuing Collection., is to digeft 

 in a convenient Method, all the 

 moft curious Phtlofofhical and Ma- 

 thematkal Difcoveries, as they are 

 to be met with, which may any 

 way tend to theilfe of Life or Ad- 

 vancement of Arts and Sciences, 



s 



OM Eof the Principal Dif- 

 coveries and Enquiries, both 



A i 



And 



