INTRODUCTION. ix 



In the fecond book, 1 treat of the conftituting and elementary prin- 

 ciples of fhis univerfe ; or, in other words, of the ttficient and Maieri- 

 al Caules. And, under this head, I have Ipoken very largely of Mind, 

 the prime efficient caule ot every tning in the univerfe. 



The fubj ft of the third book is the Categories, or the Univerfal 

 Formal Caules of all things in Nature. 



The fourth book treats of thofe Adjunfts of Nature, Time, Space, 

 and Place. 



The ffth book treats of the principles of Science and Certainty, and 

 defends them againft the cavils of fophifts and fceptics, both an- 

 tient and modern. 



I intended to have added a fixth book, containing the Hiftory of this 

 Philofophy, and giving iome account of the authors who have treated 

 of It : But this 1 referve for the fecond part of my work ; and, in place 

 of it, I have fubjoined, by way of Appendix, a DilTertation upon the 

 Principles of the Newtonian Philofophy. 



A N T IE N T 



