" [Then follow several cases in which
mutilations practised for many generations are not found to be
transmitted.] "Notwithstanding," continues Mr. Darwin, "the above
several negative cases, we now possess conclusive evidence that the
effects of operations are sometimes inherited. Dr. Brown-Sequard
gives the following summary of his observations on guinea-pigs, and
this summary is so important that I will quote the whole:--
"'1st. Appearance of epilepsy in animals born of parents having
been rendered epileptic by an injury to the spinal cord.
"'2nd. Appearance of epilepsy also in animals born of parents
having been rendered epileptic by the section of the sciatic nerve.
"'3rd. A change in the shape of the ear in animals born of parents
in which such a change was the effect of a division of the cervical
sympathetic nerve.
"'4th. Partial closure of the eyelids in animals born of parents in
which that state of the eyelids had been caused either by the
section of the cervical sympathetic nerve or the removal of the
superior cervical ganglion.
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