nds,
according to its strength.

Mead's Accelerator.--I merely mention this as being in the market, not
knowing any thing in regard to its merits. The directions given for
its use are as follows: Mix one-third of a bottle with a wine glass
full of water, coat the plate over dry iodine to a dark gold color,
then over the accelerator to a violet, then back over dry iodine, or
chloride of iodine, from three to five seconds.

Chloride of Bromine.--M. Bissou, a French experimentalist, has found
that bromine associated with chlorine, prepared in a similar manner to
chloride of iodine, already described, a solution of bromine being
substituted for the iodine, is a very sensitive solution; by means of
it daguerreotype proofs are obtained in half a second, and, thus very
fugitive subjects are represented, making it the very best compound for
taking children. So quick is its operation, that even persons or
animals may be taken in the act of walking.

Hungarian Liquid.--This, I believe, has never been used here, or
imported into this country, and the composition of it is not generally
known, even in Europe, where it has taken precedence of all others. It
acts quickly and with considerable certainty. It is used by diluting
it with from ten to fifteen times its bulk of water, putting a
sufficient quantity into the jar to cover the bottom. The plate being
previously iodized to a light yellow, is submitted to this mixture till
it assumes a light rose tint.

Bromine and Fluoric Acid, in combination, are used by some Daguerrean
artists as a sensitive, but any of the above compounds are better;
besides this, the fluoric acid is a dangerous poison, and the quick
made from it will not repay the risk to the health in using it.

As I have before said, great caution should be observed in examining
the color of the plate, even by the feeble light allowed, which, when
attained, must be immediately placed in the holder belonging to the
camera and covered with the dark slide. You then pass to the

THIRD OPERATION.--Submitting the Plate to the action of Light in the
Camera.--Experience alone must guide the operator as to the time the
plate should be exposed to the influence of the light; this being
dependent on a variety of circumstances, as clearness of the
atmosphere--and here, a reference to the hygrometer will be of
advantage--time of day, object to be taken, and the degree of
sensitiveness imparted to the plate by the quickstuff.