"
{274b}
Mr. Wallace, who does not appear to have read Professor Weismann's
essays themselves, but whose remarks are, no doubt, ultimately
derived from the sequel to the passage just quoted from page 266 of
Professor Weismann's book, contends that the impossibility of the
transmission of acquired characters follows as a logical result from
Professor Weismann's theory, inasmuch as the molecular structure of
the germ-plasm that will go to form any succeeding generation is
already predetermined within the still unformed embryo of its
predecessor; "and Weismann," continues Mr. Wallace, "holds that
there are no facts which really prove that acquired characters can
be inherited, although their inheritance has, by most writers, been
considered so probable as hardly to stand in need of direct proof."
{275}
Professor Weismann, in passages too numerous to quote, shows that he
recognizes this necessity, and acknowledges that the non-
transmission of acquired characters "forms the foundation of the
views" set forth in his book, p.
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