he same breadth.

The _Pedestals_ which support many Pillars of the same Rank, will be
much handsomer if one make them jet out before every Pillar like a
Joynt-Stool; for otherwise, if the _Bases_ were all of one size, they
would resemble a Channel.

If Leaning-places, or Elbow-places are to be betwixt the _Pedestals_,
it's necessary that they be as high as the _Pedestals_, and that the
_Cornices_ of the _Pedestals_, and of the Leaning or Elbow-places be
equal, and have a true Proportion one to another.

[Sidenote: _Lib._ 5. _Chap._ 1.]

[Sidenote: _Lib._ 3. _Chap._ 2.]

All the Pillars ought to go diminishing towards the top, to augment
their Strength, and render them more Beautiful, imitating the Bodies of
Trees, which are greater at the Bottom than at the Top. But this
_Diminution_ must be lesser in the great Pillars which have their
highest part further from the Sight, and which by Consequence makes them
at the top seem lesser, according to the ordinary Effect of Perspective;
which always diminisheth Objects according to the measure that they are
distant from the Eye.

The Rule of this different _Diminution_ is, that a Pillar that is 15
Foot high, ought to have in the upper part 5 parts of 6 in the which the
Diameter of the _Base_ of the Pillar is divided; that which is from 15
to 20 Foot, ought to have 5 and an half of the 6 and an half of the
Diameter; that which is from 20 to 30, ought to have 6 of the 7 parts of
the Diameter; that which is from 30 to 40, must have 6 and an half of 7
and an half of the Diameter; that which is from 40 to 50, must have 7
of 8 of the Diameter. These _Diminutions_ do not belong to the _Thuscan
Order_, whose Pillars are much more diminished; as we shall show
hereafter.

[Sidenote: _Lib. 3. Chap. 3._]

Besides this _Diminution_ which is made towards the top of the Pillar,
there is another below, which makes the Pillar about the middle swell
like a Belly; the measure of this swelling is taken from the magnitude
which makes up the Distance between the _Channels_.

[Sidenote: _Lib. 3. Chap. 2._]

There is another sort of _Diminution of Pillars_, which is made of one
Pillar in respect of another; It is of 2 sorts, _viz._ when a second
rank is placed upon the first, for then the second Pillar must be lesser
a fourth part than those below, or when _Portico's_ are made that have
Pillars in the Corners, for those in the middle must be less than those
in the Corners, a 50th part.