All Advances By Degrees In Nature, And Nothing By Leaps, And This Law As Applied To Each, Is Part Of My Doctrine Of Continuity.

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All advances by degrees in Nature, and nothing by leaps, and this
law as applied to each, is part of my doctrine of Continuity. Although
there may exist in some other world species intermediate between Man
and the Apes, Nature has thought it best to remove them from us, in
order to establish our superiority beyond question. I speak of intermediate
species, and by no means limit myself to those leading to Man. I
strongly approve of the research for analogies; plants, insects, and
Comparative Anatomy will increase these analogies, especially when
we are able to take advantage of the microscope more than at present.
-- Gottfried Wilhelm Leibniz, Protogaea, 1749

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