Too much of the chlorine gas was present in my coating jar.

I would like to see some of our enterprising operators investigate this combination.
It is a singular fact, that the vapors of bromine and chlorine combining upon the iodide of silver, produce a more sensitive coating than when the two are combined in solution, as in chloride of bromine solution.

Those having Humphrey's Journal at hand, can refer to vol.
i.p.

142.
To use Bromine Water or other Accelerators in Hot Weather .-- An excellent plan for using bromine water is as follows: Fill a two-ounce bottle quarter full of it, and then fill the bottle with fine sand, which serves to preserve a low temperature; then place the bottle in a porous cup, same as used in the battery; fill this also with sand, and close the end with plaster of Paris.

Place this in a coating-box, and it will be found to act with great uniformity and be quite permanent.
Bromide of Lime, another accelerator, can be used in the same manner, except it is, only necessary, when a solid sensitive is used, to mix it with the sand without placing it in a bottle.