The burden of Mr. Thiselton Dyer's controversy with the Duke of
Argyll (see Nature, January 16, 1890, et seq.) was that there was no
evidence in support of the transmission of any acquired
modification. The orthodoxy of science, therefore, must be held as
giving at any rate a provisional support to Professor Weismann, but
all of them, including even Professor Weismann himself, shrink from
committing themselves to the opinion that the germ-cells of any
organisms remain in all cases unaffected by the events that occur to
the other cells of the same organism, and until they do this they
have knocked the bottom out of their case.
From among the passages in which Professor Weismann himself shows a
desire to hedge I may take the following from page 170 of his book:--
"I am also far from asserting that the germ-plasm which, as I hold,
is transmitted as the basis of heredity from one generation to
another, is absolutely unchangeable or totally uninfluenced by
forces residing in the organism within which it is transformed into
germ-cells.
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