The elementary particles which form the embryo are each drawn from
the corresponding structure in the parent, and conserve a sort of
remembrance of their previous form, so that in the offspring they
will reflect and reproduce a resemblance to the parents ... We can
thus readily explain how new species are formed... by supposing that
the elementary particles may not always retain the order which they
present in the parents, but may fortuitously produce differences,
which, multiplying and accumulating, have resulted in the infinite
variety of species which we see at the present time.
-- Peter Louis Moreau de Maupertuis,
-- "Systeme de la Nature: Essai sur la Formation des Corps Organises," 1751
Related:
The agreement of so many kinds of animals in a certain common structure
which seems to be fundamental not only in their skeletons, but also
in the arrangement of the other parts - so that a wonderfully simple
typical form, by the shortening and lengthening of some parts, and
by the suppression and development of others, might be able to produce
an immense variety of species - allows a ray of hope, however faint,
to enter our minds, that here perhaps some result may be obtained,
by the application of the principle of the mechanism of nature (without
which there can be no natural science in general)....