ify it. Look back to Fig. LI., above.
There are distinguished in it six forms of moulding. Of these, _c_ is
nothing but a small corner; but, for convenience sake, it is better to
call it an edge, and to consider its decoration together with that of
the member _a_, which is called a fillet; while _e_, which I shall call
a roll (because I do not choose to assume that it shall be only of the
semicircular section here given), is also best considered together with
its relative recess, _f_; and because the shape of a recess is of no
great consequence, I shall class all the three recesses together, and we
shall thus have only three subjects for separate consideration:--

1. The Angle.
2. The Edge and Fillet.
3. The Roll and Recess.

Sec. VI. There are two other general forms which may probably occur to the
reader's mind, namely, the ridge (as of a roof), which is a corner laid
on its back, or sloping,--a supine corner, decorated in a very different
manner from a stiff upright corner: and the point, which is a
concentrated corner, and has wonderfully elaborate decorations all to
its insignificant self, finials, and spikes, and I know not what more.
But both these conditions are so closely connected with roofs (even the
cusp finial being a kind of pendant to a small roof), that I think it
better to class them and their ornament under the head of roof
decoration, together with the whole tribe of crockets and bosses; so
that we shall be here concerned only with the three subjects above
distinguished: and, first, the corner or Angle.

Sec. VII. The mathematician knows there are many kinds of angles; but the
one we have principally to deal with now, is that which the reader may
very easily conceive as the corner of a square house, or square
anything. It is of course the one of most frequent occurrence; and its
treatment, once understood, may, with slight modification, be referred
to other corners, sharper or blunter, or with curved sides.

Sec. VIII. Evidently the first and roughest idea which would occur to any
one who found a corner troublesome, would be to cut it off. This is a
very summary and tyrannical proceeding, somewhat barbarous, yet
advisable if nothing else can be done: an amputated corner is said to be
chamfered. It can, however, evidently be cut off in three ways: 1. with
a concave cut, _a_; 2. with a straight cut, _b_; 3. with a convex cut,
_c_, Fig. LII.

[Illustration: Fig. LII.]

The first two methods