Order, doth likewise depend in part upon the Proportion which is between the thickness of the Pillars, and their height; but we must likewise joyn to this Proportion many other things that appertain to the principal Parts of the Pillars, and other Parts which accompany it, such as are the Gates, the Chambranles, or Door-Cases; and other things which are different in different Orders.
ART. II.
Of the Five sorts of Fabricks.
HERE are Five sorts of Fabricks; The First is called Pycnostyle, viz. where the Pillars are very close one to another, in such a Proportion that there is but from one Pillar to another, the space of a Diameter and half of the Pillar. See the Fig. AA. [Tab. 2.]
The Second is called Systile, viz. where the Pillars seem to be joyned together, are notwithstanding a little more distant one from another than in the Pycnostile; for the intercolumniation is two Diameters of the Pillars.
The Defect that is observ'd in the Systile as well as in the Pycnostile is, that the Entrance of the Fabricks which are placed in that distance are very narrow: So that Vitruvius remarks that the Ladies as they walk to the Temple hand in hand, were forced when they came thither to quit Lib. 2.
Chap. 3. one another, because they could not go two a Breast between the Pillars. See the Figure BB. [Tab. II.]
The Third is called Diastyle; viz. where the Pillars are further distant, the space of the Intercolumniation being three Diameters, and the Inconvenience is, that the space is so great, that the Architraves which lie upon the two Pillars are in danger of breaking; because the Ancients made them of one Stone. See Figure CC. [Tab. II.]