the
Walls, to chace the Besieged away with Arrows and Scorpions, and to lay
Bridges from the Towers to the Wall; they were sometimes Thirty Fathoms
high, having Twenty Stages. They were covered, as the _Tortoises_ with
raw Hides; they had each of them a Hundred Men, which were employed as
well to move them, as to annoy the Besieged.

_FINIS._

ADVERTISEMENT.

_The Figures inserted here are those only which are chiefly necessary to
the understanding of_ Vitruvius, _that is to say, those which serve for
the comprehending the Rules that Architecture gives for Buildings, now
in use. The Figures of other things, of which_ Vitruvius _treats, are
omitted, it being enough to give One only, to serve as an Example of
each kind_, viz. _one for all Temples, one for all Theatres, and one for
all Machines._

THE EXPLICATION Of the FIRST TABLE.

This Table contains the seven several sorts of Masonry; A is the first,
which was called _Reticulatum_, because it was like the Mashes of Nets;
BB is the second, it's called _Insertum_, that is to say, _bound
Masonry_, because the Stones are one bound within another, every one
being bound with four, two below, and two above: CC is the third sort,
which was particular to the _Greeks_; it may be called double binding,
for it's not only of Stones of the same course, but of two courses III.
D is the fourth, called _Isodomum_, because the Beds or Lays are equal
in height. E is the fifth, called _Pseudisodomum_, because they are of
an equal heighth. FF, GG, H is the sixth, called _Emplecton_, because it
was filled up any way in the middle. FF are the Stones which make the
Courses. K is the seventh, which may be called _Compound_, because its
Courses are of hewn Stone, and the middle filled up with Rubbish; and
these Courses are fasten'd together with Cramp-irons.

This Table refers to _pag._ 47.

[Illustration: _Plate I._]

THE EXPLICATION Of the SECOND TABLE.

This Table contains the five sorts of Edifices: AA is the _Pycnostyle_;
that is to say, where the Pillars are very close, the Intercolumniation
being but of one Diameter, and a half of the Column: BB is the
_Systyle_, _viz._ where the Pillars have two Diameters of
Intercolumniation: CC is the _Diastyle_, _viz._ where the Pillars are at
that distance, that they have for the Intercolumniation three Diameters:
DD is the _Areostyle_, where the Pillars are far asunder. There is no
certain Proportion; we have given in this Figure