other countries. It is a scientific theatre. By means of the
lantern and an admirable equipment of scientific appliances, all
new discoveries, as well as ordinary interesting and picturesque
phenomena, when new discoveries are lacking, are described and
illustrated daily to the public, who pay for seats as in an ordinary
theatre, and keep the Urania profitably filled all the year round.
Professor Spies is a young man of great mental alertness and
mechanical resource. It is the photograph of a hand, his wife's hand,
which illustrates, perhaps better than any other illustration in this
article, the clear delineation of the bones which can be obtained by
the Röntgen rays. In speaking of the discovery he said:

"I applied it, as soon as the penetration of flesh was apparent, to
the photograph of a man's hand. Something in it had pained him for
years, and the photograph at once exhibited a small foreign object, as
you can see;" and he exhibited a copy of the photograph in question.
"The speck there is a small piece of glass, which was immediately
extracted, and which, in all probability, would have otherwise
remained in the man's hand to the end of his days." All of which
indicates that the needle which has pursued its travels in so many
persons, through so many years, will be suppressed by the camera.

"My next object is to photograph the bones of the entire leg,"
continued Herr Spies. "I anticipate no difficulty, though it requires
some thought in manipulation."

It will be seen that the Röntgen rays and their marvellous practical
possibilities are still in their infancy. The first successful
modification of the action of the rays so that the varying densities
of bodily organs will enable them to be photographed, will bring all