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Updated: May 24, 2025
In short, viewing the internal secretions as determinants, by their quantitative variations, of a host of biologic phenomena furnishes a concrete and detailed foundation for Darwin's theory of pangenesis. Darwin's theory of pangenesis was an attempt to harmonize everything known in his time about heredity.
It is real good news that your book is so advanced that you are negotiating about its publication. With respect to dimorphic plants: it is a great puzzle, but I fancy I partially see my way too long for a letter and too speculative for publication. Pangenesis makes very few converts: G.H. Lewes is one.
This was the theory put forward by Darwin under the name of "pangenesis," and by others under other titles with which it is unnecessary to burden these pages.
Arguments against pangenesis can also be drawn from the case of neuter insects a fact which seems to have escaped Darwin's notice, although he had seen how strongly that case was opposed to the doctrine which is the essential basis of the theory of pangenesis. Mr.
Down, Bromley, Kent, S.E. February 27, 1868. My dear Wallace, You cannot well imagine how much I have been pleased by what you say about Pangenesis. None of my friends will speak out, except, to a certain extent, Sir H. Holland, who found it very tough reading, but admits that some view "closely akin to it" will have to be admitted.
However, the fact remains an excellent answer to the statement that sterility of hybrids proves the absolute distinctness of the parents. I have been reading with great pleasure Mr. Bentham's last admirable address, in which he so well replies to the gross misstatements of the Athenæum; and also says a word in favour of pangenesis.
Darwin's provisional theory of Pangenesis, will sufficiently show that the above is no strange and paradoxical view put forward wantonly, but that it follows as a matter of course from the conclusions arrived at by those who are acknowledged leaders in the scientific world. Mr. Darwin writes thus:
And all this political life is the spontaneous work of unintelligent units; that is to say, we have results exceeding the highest ever attained by human intelligence, long before intelligence or sentience has yet been evolved. Nobody will care to support "Pangenesis" as a theory of generation.
Darwin himself realized that the doctrine of natural selection was incomplete, as it accepted at its face value the inheritance of congenital racial qualities without attempting to describe the way an egg or any other germ bears them, and he endeavored to round out his doctrine of selection by adding the theory of pangenesis.
Strange as such an idea may be, it is easy and pellucid compared with the hypothesis of Pangenesis still more when we remember that this complex germ, which is a lion or a horse in small itself the elaboration of aeons of Evolution can replicate itself with ease and rapidity, reproducing in adjacent pabulum a "cosmos" which differs in degree, not in kind, from that described in the story of the Six Days.
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