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The great body of facts of which a condensed account has been given in
the present chapter, although from an experimental point of view very
insufficient, all point to the general conclusion we have now reached,
and afford us a not unsatisfactory solution of the great problem of
hybridism in relation to the origin of species by means of natural
selection. Further experimental research is needed in order to complete
the elucidation of the subject; but until these additional facts are
forthcoming no new theory seems required for the explanation of the
phenomena.
FOOTNOTES:
[Footnote 51: Darwin's _Animals and Plants under Domestication_, vol.
ii. pp. 163-170.]
[Footnote 52: For a full account of these interesting facts and of the
various problems to which they give rise, the reader must consult
Darwin's volume on _The Different Forms of Flowers in Plants of the same
Species_, chaps, i.-iv.]
[Footnote 53: See _Nature_, vol. xxi. p. 207.]
[Footnote 54: Low's _Domesticated Animals of Great Britain_,
Introduction, p. lxiv.]
[Footnote 55: Low's _Domesticated Animals_, p.


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