appearance of the disease in a proportion
of cases so much greater than any other circumstance common to any
portion of the inhabitants of the place under observation, as to make it
inconceivable that the succession of cases occurring in persons having
that intercourse should have been the result of chance? If so, the
inference is unavoidable, that that intercourse must have acted as a
cause of the disease. All observations which do not bear strictly on
that point are irrelevant, and, in the case of an epidemic first
appearing in a town or district, a succession of two cases is sometimes
sufficient to furnish evidence which, on the principle I have stated, is
nearly irresistible."

Possibly an inexperienced youth may be awe-struck by the quotation from
Cuvier. These words, or their equivalent, are certainly to be found in
his Introduction. So are the words "top not come down"! to be found in
the Bible, and they were as much meant for the ladies' head-dresses as
the words of Cuvier were meant to make clinical observation wait for a
permit from anybody to look with its eyes and count on its fingers. Let
the inquiring youth read the whole Introduction, and he will see what
they mean.

I intend no breach of courtesy, but this is a proper place to warn the
student against skimming the prefaces and introductions of works for
mottoes and embellishments to his thesis. He cannot learn anatomy by
thrusting an exploring needle into the body. He will be very liable to
misquote his author's meaning while he is picking off his outside
sentences. He may make as great a blunder as that simple prince who
praised the conductor of his orchestra for the piece just before the
overture; the musician was too good a courtier to tell him that it was
only the tuning of the instruments.

To the six propositions in the 142d paragraph, and the remarks about
"specific" diseases, the answer, if any is necessary, seems very simple.
An inflammation of a serous membrane may give rise to secretions which
act as a poison, whether that be a "specific" poison or not, as Dr. Homer
has told his young readers, and as dissectors know too well; and that
poison may produce its symptoms in a few hours after the system has
received it, as any may see in Druitt's "Surgery," if they care to look.
Puerperal peritonitis may produce such a poison, and puerperal women may
be very sensible to its influences, conveyed by contact or exhalation.
Whether this is so or not