We should, no doubt, over-time and under-tone, and otherwise wrong the
countenances of some of our sitters; but we should get the knack in a week
or two, and if Baron Wenzel owned to having spoiled a hat-full of eyes
before he had fairly learned how to operate for cataract, we need not
think too much of libelling a few village physiognomies before considering
ourselves fit to take the minister and his deacons. After years of
practice there is always something to learn, but every one is surprised to
find how little time is required for the acquisition of skill enough to
make a passable negative and print a tolerable picture. We could not help
learning, with the aid that was afforded us by Mr. Black and his
assistants, who were all so very courteous and pleasant, that, as a token
of gratitude, we offered to take photographs of any of them who would sit
to us for that purpose. Every stage of the process, from preparing a plate
to mounting a finished sun-print, we have taught our hands to perform, and
can therefore speak with a certain authority to those who wish to learn
the way of working with the sunbeam.

Notwithstanding the fact that the process of making a photographic picture
is detailed in a great many books,--nay, although we have given a brief
account of the principal stages of it in one of our former articles, we
are going to take the reader into the sanctuary of the art with us, and
ask him to assist, in the French sense of the word, while we make a
photograph,--say, rather, while the mysterious forces which we place in
condition to act work that miracle for us.

We are in a room lighted through a roof of ground glass, its walls covered
with blue paper to avoid reflection. A camera mounted on an adjustable
stand is before us. We will fasten this picture, which we are going to
copy, against the wall. Now we will place the camera opposite to it, and
bring it into focus so as to give a clear image on the square of ground