strument is made
to look at the objects through this contracted aperture, the resulting
image is much more sharp and correct. But it takes a longer time to
impress itself upon the paper, because, in proportion as the aperture is
contracted, fewer rays enter the instrument from the surrounding objects,
and consequently fewer fall upon each part of the paper.

[PLATE IV. ARTICLES OF GLASS.]

PLATE IV. ARTICLES OF GLASS.

PLATE IV. ARTICLES OF GLASS.

The photogenic images of glass articles impress the sensitive paper with a
very peculiar touch, which is quite different from that of the China in
Plate III. And it may be remarked that white china and glass do not
succeed well when represented together, because the picture of the china,
from its superior brightness, is completed before that of the glass is
well begun. But coloured china may be introduced along with glass in the
same picture, provided the colour is not a pure blue: since blue objects
affect the sensitive paper almost as rapidly as white ones do. On the
contrary, green rays act very feebly--an inconvenient circumstance,
whenever green trees are to be represented in the same picture with
buildings of a light hue, or with any other light coloured objects.

[PLATE V. BUST OF PATROCLUS.]

PLATE V. BUST OF PATROCLUS.

PLATE V. BUST OF PATROCLUS.

Statues, busts, and other specimens of sculpture, are generally well
represented by the Photographic Art; and also very rapidly, in consequence
of their whiteness.

These delineations are susceptible of an almost unlimited variety: since
in the first place, a statue may be placed in any position with regard to
the sun, either directly opposite to it, or at any angle: the directness
or obliquity of the illumination causing of course an immense difference
in the effect. And when a choice has been made of the direction in which
the sun's rays shall fall, the statue may be then turned round on its
pedestal, which produces a second set of variations no less considerable
than the first. And when to this is added the change of size which is
produced in the image by bringing the Camera Obscura nearer to the statue
or removing it further off, it becomes evident how very great a number of
different effects may be obtained from a single specimen of sculpture.

With regard to many statues, however, a bet