o
you say to that, madame?"

"You lie," screamed the woman, rushing frantically past us. "I am his
daughter. No interlopers shall separate us Father!"

The old man moved feebly away from her.

"Send for Dr. Scott again," she demanded. "See if he cannot be found.
He must be found. You are all enemies, villains."

She addressed Kennedy, but included the whole room in her
denunciation.

"Not all," broke in Kennedy remorselessly. "Yes, madame, send for Dr.
Scott. Why is he not here?"

Prescott, with one hand on my arm and the other on Dr. Burnham's, was
moving toward the door.

"One moment, Prescott," interrupted Kennedy, detaining him with a
look. "There was something I was about to say when Dr. Burnham's
urgent message prevented it. I did not take the trouble even to find
out how you obtained that little globule of molten gold from the
crucible of alleged copper. There are so many tricks by which the gold
could have been 'salted' and brought forth at the right moment that it
was hardly worth while. Besides, I had satisfied myself that my first
suspicions were correct. See that?"

He held out the little piece of mineral I had already seen in his hand
in the alchemist's laboratory.

"That is a piece of willemite. It has the property of glowing or
fluorescing under a certain kind of rays which are themselves
invisible to the human eye. Prescott, your story of the transmutation
of elements is very clever, but not more clever than your real story.
Let us piece it together. I had already heard from Dr. Burnham how Mr.
Haswell was induced by his desire for gain to visit you and how you
had most mysteriously predicted his blindness. Now, there is no such
thing as telepathy, at least in this case. How then was I to explain
it? What could cause such a catastrophe naturally? Why, only those
rays invisible to the human eye, but which make this piece of
willemite glow--the ultra-violet rays."

Kennedy was speaking rapidly and was careful not to pause long enough
to give Prescott an opportunity to interrupt him.

"These ultra-violet rays," he continued, "are always present in an
electric arc light though not to a great degree unless the carbons
have metal cores. They extend for two octaves above the violet of the
spectrum and are too short to affect the eye as light, although they
affect photographic plates. They are the friend of man when he uses
them in moderation as Finsen did in the famous blue light treatment.
But