The other is a little hollowed; to make this hollowness, a Square must be made, whose Side must be equal to the _Pan_, in which the _Channelling_ is to be made, and having put one foot of the Compass in the middle of the Square, make a crooked Line from one Angle of the _Channelling_ to the other, both these _Channellings_ are made up to the number of Twenty. [Sidenote: _Lib. 4. Chap. 1._] [Sidenote: _Lib. 4. Chap. 4._] The other Orders have 24, and sometimes 32, when it is design'd to make the Pillars seem greater than they are; for the Eye judgeth that all things are greater when they have more and different Marks, which lead as it were the Sight to more Objects at once. These _Channellings_ are deeper than those of the _Dorick Order_, and the depth ought to be just so much, that a Carpenter's Rule being put into the Cavity, touch with its Angle the bottom, and with its sides the two Corners of the _Channelling_. _Vitruvius_ hath not taught us what the Proportions of the _Channelling_ should be, in respect of the _Fillet_ which makes up the space between the _Channellings_, nor what the breadth of the _Fillet_ should be, which he hath establish'd for the rule of the swelling Belly of the Pillar. The _Piedement_ is composed of a _Tympan_ and _Cornices_; to have the true height of the _Tympan_, we must divide the breadth which is between the two ends of the _Cymatium_ of the _Larmier_, or _Drip_ which supports the _Piedement_, into 9 parts, and give one to the _Tympan_. The thickness of the _Cornice_ being added to this 9th part, makes up the height of the whole _Piedement_ or _Fronton_. The _Tympan_ ought to be Perpendicular upon the _Gorge_ of the Pillar, the things that are common to all _Cornices_ are, that the _Cornice_ of the _Piedement_ must be equal to that below, excepting the last great _Cymatium_, which ought not to be upon the _Cornice_ below the _Piedement_, but it ought to go over the _Cornices_ which are sloping upon the _Piedement_ or _Fronton_. This great _Cymatium_ ought to have of height an 8th part more than the _Crown_, or _Drip_, or _Larmier_. In places where there are no _Piedements_, in the great _Cymatiums_ of the _Cornices_, must be cut the Heads of Lions, at such a distance, that there must be one directly upon every Pillar, and that the other answer directly upon the great _Dalles_, that cover the House. These Heads of Lions are pierced through to convey the Water which falls from the Roof upon the _Cornice_: The Heads of the Lions which are not directly upon the Pillars, ought not to be pierced, to the end the Water may flow with the greater impetuosity through those which are directly upon the Pillars, and that it may not fall between the Pillars upon those who are to go into the _Portico's_.