off with a fine camels hair brush, or duster. The finishing polish
is now to be given.

For this purpose the rouge--or a mixture of rouge and lamp-black, in
the proportion of one part of the former to seven of the latter--is used.
It should be kept either in a muslin bag, or wide mouth bottle,
over which a piece of muslin is tied--in fact, both the rottenstone
and tripoli should be preserved from the dust in the same manner.
With a little of this powder spread over the buff--described on page 53--
the plate recieves its final polish; the circular motion is changed
for a straight one across the plate, which, if intended for a portrait,
should be buffed the narrow way; but if, for a landscape or view of a house,
the length way of the plate.

The operation of cleaning the plate at first appears difficult
and tedious, and many have been deterred from attempting this
interesting art on that account; but, in reality, it is more
simple in practice than in description, and with a little
patience and observation, all difficulties are easily overcome.
Great care must be taken to keep the buff free from all
extraneous matter, and perfectly dry, and when not in use it
should be wrapped up in tissue paper, or placed in a tight box.

The plate should be buffed immediately before the sensitive
coating is given; particles of dust are thus effectually removed;
the temperature of the plate is also increased by the friction,
and the required tint more readily obtained.

SECOND OPERATION.--Applying the sensative coating.--The apparatus
and chemicals required, are an