2 The Natural liipory 



be guided wholly by Matter of Fa5i ^ 

 as intending to fteer that courfe which 

 is thus agreed of all hands to be the 

 beft and fureft : and not to offer any 

 thing but what hath due warrant from 

 Obfervations ; and thofe both careful- 

 ly made, and faithfully related. 



And that each Reader may the bet- 

 ter inform himfelf, not only of what 

 fort my prefent Obfervations are, but 

 fee in what manner alCb, and with what 

 kind of Accuracy they were made, 

 'twill be convenient to give fbme 

 light into that matter, and to begin 

 with an Account of them ; whereby 

 he may be enabled to judge how far 

 ' they may. be relyed upon, and what 

 iteafure of Aflfent the Propofitions 

 which I draw from them may claim. 



But before I go any farther, I ought 

 to put in a Caution, that an ample and 

 prolix Relation either of the Obferva- 

 tions themfelves, or of the Deduftions 

 from them, is not to be expefted here, 

 I defign thu but for a Sample of what 

 I hope, in good time, more fully to 

 difcufs and make out : propofing no 

 more in this Treatife, than only, in a, 

 few plain words, to deliver my Senti- 

 ments on certain Heads of Natural 



Hiftoryj 



