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Jean-Baptiste Lamarck has 18 quotes on this site. A few more worth reading:

• After having produced aquatic animals of all ranks and having caused extensive variations in them by the different environments provided by the…
• In every animal which has not passed the limit of its development, a more frequent and continuous use of any organ gradually…
• However, if we consider that all the characteristics which have been cited are only differences in degree of structure, may we not…
• One must believe that every living thing whatsoever must change insensibly in its organization and in its form... One must therefore never…
• All the acquisitions or losses wrought by nature on individuals, through the influence of the environment in which their race has long…
• The great age of the earth will appear greater to man when he understands the origin of living organisms and the reasons…
• It is not the organs-that is, the character and form of the animal's bodily parts-that have given rise to its habits and…
• What nature does in the course of long periods we do every day when we suddenly change the environment in which some…
• A sound Physics of the Earth should include all the primary considerations of the earth's atmosphere, of the characteristics and continual changes…
• Life, in a body whose order and state of affairs can make it manifest, is assuredly, as I have said, a real…
• It is not enough to discover and prove a useful truth previously unknown, but that it is necessary also to be able…
• Now this circumscribed power, which we have scarcely examined, scarcely studied, this power to whose actions we nearly always attribute an intention…

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