Alberti, Leone Battista, Architecture, 1755

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1ſtanding at equal Diſtances from each other,
took
up the other ſive ſevenths of the whole
Length
of the Circus.
One Goal was joined to
the
other by a Kind of Breaſt-wall which was
never
leſs than ſix Foot high, to keep the
Horſes
that were running from croſſing out of
one
Courſe into the other.
On each Side of
the
Circus were Seats raiſed to the Height of
never
more than the fifth, nor leſs than the
ſixth
of the whole Breadth of the middle Area;
and
theſe Seats began from a Baſement, as in
Amphitheatres
, that the Spectators might not
be
within reach of any Hurt from the Beaſts.
Among publick Works we may reckon thoſe
publick
Walks, in which the Youth exerciſe
themſelves
at Tennis, Leaping, or the Uſe of
Arms
, and where the old Men walk to take
the
Air, or if they are infirm, are carried about
for
the Recovery of their Health. Celſus, the
Phyſician
, ſays, that Exerciſe is much better
in
the open Air, than under Cover; but that
they
might exerciſe themſelves more commo­
diouſly
even in the Shade, they added Porti­
coes
which encloſed the whole Square.
The
Square
itſelf was ſometimes paved with Marble
and
Moſaick Work, and ſometimes turfed with
Graſs
, and planted with Myrtles, Juniper,

Cypreſs
and Cedar Trees.
The Porticoes on
three
Sides were ſingle, and ſo large, that their
Proportion
was two ninth Parts greater than
that
of the Forum before treated of in this
Book
; but on the fourth Side, which fronted
the
South, the Portico was yet more ſpacious,
and
double.
In Froat it had Doric Columns,
whoſe
Height was equal to the Breadth of the
Portico
; the Columns behind, which divided
the
inner Portico from the outward, were
higher
than the former one fifth Part, for ſup­
porting
the Cover, and giving a Slope to the
Roof
; and for this Reaſon they made them of
the
Ionic Order, Ionic Columns being in their
very
Nature taller than the Doric: Though I
cannot
ſee why the Cieling of theſe Porticoes
ſhould
not have been exactly level, which cer­
tainly
muſt have been more beautiſul to the
Eye
.
In both theſe Colonades, the Diameters
of
the Columns were as follows: In the Do­
ric
, the lower Diameter of the Shaft was two
fifteenths
of the whole Height, including the
Baſe
and Capital; but in the Ionic and Corin­
thian
, the lower Diameter of the Shaft was
three
ſixteenths of the Length of only the Shaft
of
the Column.
In other Reſpects they were
the
ſame as thoſe uſed in Temples.
To the
back
Walls of theſe Porticoes, they added hand­
ſome
Walls or Rooms, where Philoſophers and
Men
of Knowledge might converſe and diſ­
pute
upon the nobleſt Subjects; and of theſe
Rooms
, ſome were proper for Winter, and
others
for Summer.
Thoſe which lay any
thing
to the North, were for Summer, as
thoſe
to the South, and which were not ex­
poſed
to any ſharp Winds, were for Winter;
beſides
that thoſe for Winter were ſhut in with
entire
Walls, whereas thoſe for Summer were
full
of Windows, or rather were ſeparated only
by
a Colonade, and had an open View to­
wards
the North, with Proſpects of Sea, Hills,
Lakes
, or ſome other agreeable Landskip, and
admitted
as much Light as poſſible.
The Por­
ticoes
on the Right and Left of theſe Squares,
had
the ſame Sort of back Rooms, ſhut in
from
Winds, but open to the Morning and to
the
Evening Sun, which ſhone in upon them
from
the middle Area.
The Plan of theſe
retiring
Rooms was various, ſometimes they
were
ſemicircular, ſometimes rectangular, but
always
in a due Proportion to the Square itſelf,
and
to the Porticoes which encompaſſed it
it
.
The Breadth of the whole Square with its
Porticoes
, was half its Length, and this Breadth
was
divided into eight Parts, ſix whereof were
given
to the open Square, and one to each
Portico
.
When the back retiring Rooms were
ſemicircular
, their Diameter was two fifths of
the
open Area.
In the back Wall of the Por­
ticoes
, were the Apertures for Entrance, and
for
Light into thoſe Rooms.
The Height of
the
ſemicircular Retirements, in the greateſt
Proportion
, was only equal to their Breadth;
but
in ſmaller Works, it was one fifth Part
more
.
Over the Top of the Roof of the Por­
tico
, Openings were broke for the Admiſſion
of
a ſtronger and more chearful Light into the
Room
.
If theſe Withdrawing-rooms were ſquare,
then
their Breadth was twice the Breadth of the
Porticoes
, and their Length twice their own
Breadth
.
That I call Length which runs along
with
the Portico, ſo that upon entering into thoſe
Rooms
from the Right, their Length lies to the
Left
, and entering them from the Left, to the
Right
.
Among publick Works, we are alſo to in­
clude
the Portico for the inferior Judges, which
the
Ancients uſed to build after the following
Manner
: Their Bigneſs was according to the
Dignity
of the City, but rather too large than
too
ſmall, and along them was a Row of
Chamters
, contiguous to each other, where
petty
Conteſts were heard and determined.
Thoſe Works which I have hitherto deſcribed

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