t many things. In some, my suspicions have proved correct. In
others, I am still entirely in the dark. One important point, however,
I have established, namely, the means by which this curious,
mysterious effect has been produced upon the minds of both your
daughter and myself. When one knows the disease then it is not
difficult to search for the cure. I know how the effect was produced,
and further, I know the name of the medical man who has effected cures
in similar cases."

"You do?" she exclaimed eagerly. "Well, Gabrielle has seen a dozen
specialists, all of whom have been puzzled."

"Professor Gourbeil, of Lyons, has been able to gain complete cures in
two cases. Orosin, a newly discovered poison, is the drug that was
used, and the Professor has a wider knowledge of the effect of that
highly dangerous substance than any person living. You should arrange
to take your daughter to him."

The pale-faced widow shook her head, and in a mournful tone, replied:

"Ah! I am afraid it would be useless. Doctor Moroni took her to
several specialists, but they all failed to restore her brain to its
normal activity."

"Professor Gourbeil is the only man who has ever been able to
completely cure a person to whom orosin has been administered--and
that has been in two cases only."

"So the chance is very remote, even if she saw him," exclaimed the
widow despairingly.

"I think, Mrs. Tennison, that Gabrielle should see him in any case," I
said.

"I agree. The poor girl's condition is most pitiable. At times she
seems absolutely normal, and talks of things about her in quite a
reasonable manner. But she never seems able to concentrate her
thoughts. They always wander swiftly from one subject to another. I
have noticed, too, that her vision is affected. Sometimes she will
declare that a vivid red is blue. When we look into shop windows
together she will refer to a yellow dress as mauve, a pink as white.
At times she cannot distinguish colours. Yet now and then her vision
becomes quite normal."

"I have had some difficulty, Mrs. Tennison, in that way myself," I
said. "When I first left St. Malo, after recovering consciousness of
the present, I one day saw a grass field and it appeared to be bright
blue. Again, an omnibus in London which I knew to be blue was a
peculiar dull red. So my symptoms were the same as your daughter's."

"It seems proved that both of you are fellow-victims of some desperate
plot, Mr. Garfield," sai