or to a dark brown when employed for the first coating.
This latter mixture has been sold in our market under the name
of "Iodide of Brome."

Iodide of Bromine.--(See page 76.)

Experiments with Iodine.--Place a plate which bas been exposed in the camera
over the vapor of iodine for a very brief period, and it will present
the appearance of the impression having been solarized.

b. Upon a Daguerreotype plate, from which an impression has
been effaced by rubbing or otherwise, the picture may be made
to reappear by merely coating it over with iodine.

c. Place in a vessel a little water, into which put the smallest
possible quantity of free iodine and add a little starch, and the liquid
will instantly assume a blue color. Advantage is taken of this fact
in the laboratory to detect the presence of iodine in liquids.
The starch should be dissolved in boiling water and allowed to cool.
There are numerous other interesting experiments that can be performed
by the aid of iodine, but it is unnecessary here to consume more space.


CHLORINE.

History.--The Swedish chemist, Scheele, in 1774, while examining the action
of hydrochloric acid on peroxide of manganese, first noticed this element.
He called it dephlogisticated muriatic acid. It was afterwards,
by the French nomenclaturists, termed oxygenated muriatic acid,
conceiving it to be a compound of oxygen and muriatic acid.