or when the thermometer indicates a heat above 60 deg.

Bromide of Potassium--Is prepared by mixing bromine and a
solution of pure potass together, and evaporating to dryness;
it crystallizes in small cubes, and dissolves readily in water.
This agent is extensively employed in the paper and glass processes.

Bromide of Lime. This the principal accelerator used in the American
practice, and is the best of all dry combinations at present employed.
There are many reasons why the dry is advantageous; these are too
familiar to repeat.

"The bromide of lime may be produced by allowing bromine vapor to act
upon hydrate of lime for some hours. The most convenient method of doing
this is to place some of the hydrate at the bottom of the flask, and then
put some bromine into a glass capsule supported a little above the lime.
As heat is developed during the combination, it is better to place
the lower part of the flask in water at the temperature of about 50 deg.
Fah.; the lime gradually assumes a beautiful scarlet color, and acquires
an appearance very similar to that of the red iodide of mercury.
The chloro-iodide of lime may be formed in the same manner; it has a deep
brown color. Both these compounds, when the vapor arising from them
is not too intense, have an odor analogous to that of bleaching powder,
and quite distinguishable from chlorine, bromine, or iodine alone."

Farther on, I have given, in connection with accelerators, a process I adopt,
which is far less tedious and equally reliable.

Bromide of Silver--May be formed by pouring an alkaline bromide
into a solution of nitrate of silver, in the shape of a white,