Chap,r, ANTIENT METAPHYSICS. 373 



BOOK V, 



Concerning the Principles of Science, and of Truth 

 and Certainty. 



CHAP. I. 



The Principles of all Arts and Sciences to he found in Metaphyftcs — li 

 belongs to Metaphyftcs to explain the Principles of Science <, and to de^ 

 Jend them againjl the Cavils of Sophifts — Truth Logical and Meta- 

 phyfical — Logical Truth or Propojitions the Suhje6l of this Chapter — 

 Propofttions analyzed — In all Propofitions, one Term at leaf mufl he 

 a General or Idea — Divifion of Propofttions into thqfe *which have 

 both Terms general, and thofe ivhich have only one. 



IT has been often faid, in the courfe of this work, that it is in the 

 firft phiiofophy that we are to feek for the principles of all arts and 

 fciences : And, indeed, it is a matter of common obfervatlon, that 

 CTery deep difquifitlon, upon any fubje6t, ends in metaphyfics. This 

 I fhall afterwards (how more at large, and prove by particular exam- 

 ples. But, in this chapter, I propofe to inquire what is the principle 

 of all fcience and demonftration of every kind — an inquiry which, I 



think, 



