Chloride of Iodine as an Accelerator.--This is probably one of the best
accelerators that can be used for coating the plate for taking views;
it works too slow, however, to meet the wants of the operating room,
yet its use was formerly, for a long time, adhered to by some of our
best professors. In producing views with this, we are successful in
obtaining well-developed impressions, with a depth of tone and richness
of appearance not to be met with in the productions of any other substances.
I give its use as furnished me by an old and experienced operator,
and published in Humphrey's Journal, vol. i. p. 180:

"As the process of using chloride of iodine may be of interest to some
of our subscribers, I take pleasure in giving the following manipulation.
To one ounce of chloride of iodine add two ounces of water;
place this mixture in a coating-box, the same as quick stuff;
coat the plate with dry iodine to a light yellow, or lemon color;
then bring the coating to a deep pink over the chloride.
The plate must be recoated over the dry iodine."

This combination has been very successfully used in one of our
most extensive establishments in this city, and the superiority
of the pictures produced by it was considered as an equivalent
for the additional time required to bring out the impressions.

Chlorine as an Accelerator.--I shall here refer to but a single
experiment in which I employed chlorine gas for coating the plate.
I was provided with a retort, the neck of which was fitted to the jar
of my coating-box, through a hole drilled for its reception.
This was fitted perfectly tight in my coating-box. I placed
some pure undiluted bromine water and the agents necessary