now used by many, and is very good for taking views.

Lime Water Quick.--This mixture is more used at present than all the
other liquids ever introduced. It produced the most uniform results,
giving the fine soft tone so characteristic in pictures produces from
accelerators containing chlorine. To one quart of lime water (this can
be had of any druggist) add one and a half ounce of pulverized alum.
This should be shook at intervals for twenty--four hours; then add one
ounce of chloride of iodine and three fourths ounce of bromine.

Lime Water.--This is easily prepared by putting lime into water, say a
piece of quick-lime about the size of an egg into one quart of water.
This should be shook occasionally for two or three days and allowed to
settle, when the water can be poured off and used.

Use.--To one part of quick add six parts of water; coat to a light
yellow over the iodine, to a rose color over the quick, and recoat
about one tenth. The above coating may be increased or diminished, it
matters not, so that there is not too much, and the proper proportions
are preserved. Some add to the above a small quantity of magnesia, say
about a teaspoonful to the quart of liquid.

Liquid Accelerator, No. 2.--The following was for a long time used by
one of the first houses in the United States, and probably was one of
the first liquids ever used. It produces a fine-toned picture, but is
not considered as sure as the lime water quick:

Take rain water one quart, add pulverized alum until it is a little
sour to the taste, and a small piece, say one half inch square, of
magnesia. Filter through paper, and add chloride of iodine one half
ounce, bromine sufficient to take it up, which is a little less than
half an ounce.

Charge with one of quick to six of water; coat over iodine to a soft
yellow, nearly, but not quite, bordering on a rose; over quick to a
dark purple, or steel, and back one sixth to one tenth.

Wolcott's American Mixture.--Van Loan Quick.--This mixture was first
formed and used by T. Wolcott & Johnson and gained great celebrity for
its productions. I have now a bottle hermetically sealed that contains
about a half ounce of this mixture prepared in 1841 by John Johnson,
now a resident of this city, and the former partner of Mr. Wolcott.
The preparation of this mixture, as furnished by Mr. Johnson himself,
is given as follows:

"One part of bromine, eight parts of nitric acid, sixteen parts of
muriat