(V) 



THE 



PREFACE 



O attempt any Thing for the 

 hnpro'vement of ufefnl Arts^ ii 

 a Debt thai every capable Per- 

 fon onves to the Puhlick, all 

 Ci-vil Societies halving a Right 

 to the Property of prinjate Per- 

 fons for the common Good. 



/ wtif fubmit the fclloi-ving 



Pages to the Cenfure of the Worlds but I beg to he 

 judged by capable fudges ; for it is not every Pre- 

 tender to Medicine [of honxj great Repute foe-oer) 

 that ts a competent fudge of fame demonfrated 

 Truths. 



I do not fay that the PraSlice of Phyfck enjer ivill 

 he, much lefs that it no^v is, the Objeh of mathema- 

 tical Certainty ; But this I dare affert\ that nuhat 



Im- 



