the rays of light
coming from above, and the head of the window may be left horizontal, or
even the whole aperture sloped outwards, as the slit in a letter-box
is inwards.

The best windows for outlook are, of course, oriels and bow windows, but
these are not to be considered under the head of apertures merely; they
are either balconies roofed and glazed, and to be considered under the
head of external appliances, or they are each a story of an external
semi-tower, having true aperture windows on each side of it.

Sec. XII. 2. Inlet windows. These windows may, of course, be of any shape
and size whatever, according to the other necessities of the building, and
the quantity and direction of light desired, their purpose being now to
throw it in streams on particular lines or spots; now to diffuse it
everywhere; sometimes to introduce it in broad masses, tempered in
strength, as in the cathedral colored window; sometimes in starry
showers of scattered brilliancy, like the apertures in the roof of an
Arabian bath; perhaps the most beautiful of all forms being the rose,
which has in it the unity of both characters, and sympathy with that of
the source of light itself. It is noticeable, however, that while both
the circle and pointed oval are beautiful window forms, it would be very
painful to cut either of them in half and connect them by vertical
lines, as in Fig. XLIV. The reason is, I believe, that so treated, the
upper arch is not considered as connected with the lower, and forming an
entire figure, but as the ordinary arch roof of the aperture, and the
lower arch as an arch _floor_, equally unnecessary and unnatural. Also,
the elliptical oval is generally an unsatisfactory form, because it
gives the idea of useless trouble in building it, though it occurs
quaintly and pleasantly in the former windows of France: I believe it is
also objectionable because it has an indeterminate, slippery look, like
that of a bubble rising through a fluid. It, and all elongated forms,
are still more objectionable placed horizontally, because this is the
weakest position they can structurally have; that is to say, less light
is admitted, with greater loss of strength to the building, than by any
other form. If admissible anywhere, it is for the sake of variety at the
top of the building, as the flat parallelogram sometimes not
ungracefully in Italian Renaissance.

[Illustration: Fig. XLIV.]

Sec. XIII. The question of bevelling become