ust a sufficient quantity of the
coloring matter will remain as is necessary for the color sensitiveness.

For the correctness of what I have said here, the following experiment
made by me will speak:

I mixed with an emulsion a quantity of coloring matter five times
increased, flowed a plate with same, which I then exposed, but obtained
no picture whatever.

The same emulsion I placed for fourteen days in alcohol, washed it well,
and flowed a plate again, which latter had not only the full color
sensitiveness, but almost equaled an ordinary emulsion plate in total
sensitiveness.

From this can be concluded that--as above said--by placing the emulsion
in alcohol, all superfluous coloring matter is removed from the same, and
that only the quantity necessary for the color sensitiveness remains
therein.

Further, it may be mentioned that it might be of advantage to add to all
emulsions eosine besides iodide of silver, because this will give to the
emulsion clearness and brilliancy besides color sensitiveness, and
produce fine lights.

Finally, I express the hope that these communications may be useful to
the practical photographer, and it is my intention to report also about
other coloring matters at some future time.--_H.D., in Anthony's
Bulletin._

* * * * *

A NEW PHOTOGRAPHIC APPARATUS.

This apparatus consists of a box containing a camera, A, and a frame, C,
containing the desired number of plates, each held in a small frame of
black Bristol board. The camera contains a mirror, M, which pivots upon
an axis and is maneuvered by the extreme bottom, B. This mirror stops at
an angle of 45 deg., and sends the image coming from the objective to the
horizontal plate, D, at the upper part of the camera. The image thus
reflected is righted upon this plate.

[Illustration: NEW PHOTOGRAPHIC APPARATUS.]

As the objective is of short focus, every object situated beyond a
distance of three yards from the apparatus is in focus. In exceptional
cases, where the operator might be nearer the object to be photographed,
the focusing would be done by means of the rack of the objective. The
latter can also slide up and down, so that the apparatus need not be
inclined when buildings or high trees are being photographed. The door,
E, performs the _role_ of a shade. When the apparatus has been fixed upon
its tripod and properly directed, all the operator has to do is to close
the door, P, a