Sulphuric Acid--Accelerating Substances--Liquid Sensitives--
Dry Sensitives, etc., etc.

BROMINE.

An article so extensively used in the practice of the Daguerreotypic art
as Bromine, is deserving of especial attention, and accordingly every person
should endeavor to make himself familiar with its properties and applications.

History.--This element was discovered in 1826 by M. Balard,
in the mother-liquor, or residue of the evaporation of sea-water.
It is named from its offensive odor (bromos, bad odor). In
nature it is found in sea-water combined with alkaline bases,
and in the waters of many saline springs and inland seas.
The salt springs of Ohio abound in the compounds of bromine,
and it is found in the waters of the Dead Sea. The only use which has
been made of bromine in the arts is in the practice of photography.
It is also used in medicine In a chemical point of view it
is very interesting, from its similarity in properties,
and the parallelism of its compounds to chlorine and iodine.

Dr. D. Alter, of Freeport, Pa., is the only American manufacturer,
and furnishes all of the "American Bromine." Yet we understand
much purporting to be of German manufacture is prepared from
that made in Freeport. This is done by individuals in this city,
who get well paid for the deception.

For the successful application of bromine as an accelerating agent,
we are indebted to Mr. John Goddard of London, who at the time was
associated with Mr. John Johnson, now a resident of this city.