ther
must be having an ophthalmia like mine;' and, as I had exclaimed
against such an assertion, he showed me a few days afterwards a
letter just received by him from his brother, who was at that time
at Vienna, and who expressed himself in these words--'I have my
ophthalmia; you must be having yours.' However singular this story
may appear, the fact is none the less exact; it has not been told to
me by others, but I have seen it myself; and I have seen other
analogous cases in my practice. These twins were also asthmatic, and
asthmatic to a frightful degree. Though born in Marseilles, they
were never able to stay in that town, where their business affairs
required them to go, without having an attack. Still more strange,
it was sufficient for them to get away only as far as Toulon in
order to be cured of the attack caught at Marseilles. They travelled
continually, and in all countries, on business affairs, and they
remarked that certain localities were extremely hurtful to them, and
that in others they were free from all asthmatic symptoms."

I do not like to pass over here a most dramatic tale in the
_Psychologie Morbide_ of Dr. J. Moreau (de Tours), M. edecin de
l'Hospice de Bicetre. Paris, 1859, p. 172. He speaks "of two twin
brothers who had been confined, on account of monomania, at Bicetre":--

"Physically the two young men are so nearly alike that the one is
easily mistaken for the other. Morally, their resemblance is no less
complete, and is most remarkable in its details. Thus, their
dominant ideas are absolutely the same. They both consider
themselves subject to imaginary persecutions; the same enemies have
sworn their destruction, and employ the same means to effect it.
Both have hallucinations of hearing. They are both of them
melancholy and morose; they never address a word to anybody, and
will hardly answer the questions that others address to them. They
always keep apart, and never communicate with one another. An
extremely curious fact which has been frequently noted by the
superintendents of their section of the hospital, and by myself, is
this: From time to time, at very irregular intervals of two, three,
and many months, without appreciable cause, and by the purely
spontaneous effect of their illness, a very marked change takes
place in the condition of the two brothers. Both of them, at the
same time, and often on the same day, rouse themselves from their
habitual stupor and prostration; they mak