Development is already well advanced before Lamarckian factors can operate at all.
Neither jaws nor brain can have been evolved on the Lamarckian principle.
Darwin moreover was a Lamarckian to the extent that he was inclined to think that acquired characteristics could be inherited.
But even in the two Lamarckian factors there is a difference in grade.
When a boy, I used to arrange my collection of shells by the Lamarckian system, which had replaced the old Linnean classification.
Lamarckian views have never lacked defenders here and in America.
Even a Lamarckian will allow this to be within the range of possibility.
Oken was spinning in metaphysical Germany his fanciful parodies of the Lamarckian hypothesis.
But it must be remembered that this is a different thing from saying that the Lamarckian interpretation is the true one.
Such hazy and indistinct thinkers as these are still really at the prior stage of Lamarckian evolutionism.
1846, pertaining to French botanist and zoologist J.B.P. Lamarck (1744-1829), especially his view that the process of evolution includes the inheritance of acquired characteristics.