I make a Distinction between the _Ancient_ Architecture, and the _Antique_ Architecture, and the _Modern_; for we call that Architecture _Ancient_ of which _Vitruvius_ has writ, and of which we may as yet see many Examples in the Fabricks that remain in _Greece_. The Architecture which we call _Antique_, is that which may be found in the Famous Edifices, which, since the Time of _Vitruvius_, were built at _Rome_, _Constantinople_, and many other places. The _Modern_, is that which being more accommodated to the present use, or for other Reasons, has changed some of the Dispositions and Proportions which were observed by the _Ancient_ and _Antique_ Architects. ART. II. _The Method of the Works of_ Vitruvius, _with short Arguments of every Book._ [Sidenote: _Lib. 1. Chap. 3._] All his Works are divided into Three Parts: The First Treats of Building; The Second is Gnomonical, and treats at large of Astronomical and Geometrical Affairs. The Third gives Rules and Examples for making Machines or Engines serviceable, either in War or Building. The First Part is treated of in the Eight first Books: The Second in the Ninth: The Third in the Last. The First Part which relates to Building is twofold, for they are either publick or private. He speaks of private Buildings in the Sixth Book; and as to that which relates to publick Buildings, it's likewise divided into Three Parts, _viz._ That which has Relation to Security, which consists in Fortifications, described in the Third Chapter of the First Book; That which appertains to Religion, of which he treats in the Third and Fourth Books, and that which relates to publick Conveniencies, as _Town-Houses_, _Theatres_, _Baths_, _Academies_, _Market-places_, _Gates_; of which he treats in the Fifth Book. The Gnomonical part is treated of in the Ninth Book. The Third Part which treats of Machines, is treated of in the Tenth and Last Book. Besides these particular Matters of Architecture, there are Three things that appertain to all sort of Edifices, which are, Solidity, Convenience, and Beauty. He speaks of Solidity in the Eleventh Chapter of the Sixth Book; of Convenience, in the Seventh Chapter of the same Book; and of Beauty through the whole Chapter of the Seventh Book; which contains all the Ornaments that Painting and Sculpture are capable of giving to all sorts of Fabricks; and as to Proportion, which ought to be esteemed one of the principal Foundations of Beauty, it's treated of throughout all his Works.