Jean-Baptiste Lamarck

One must believe that every living thing whatsoever must change insensibly in its organization and in its form... One must therefore never…

— Jean-Baptiste Lamarck

All known living bodies are sharply divided into two special kingdoms, based upon the essential differences which distinguish animals from plants, and…

— Jean-Baptiste Lamarck

After having produced aquatic animals of all ranks and having caused extensive variations in them by the different environments provided by the…

— Jean-Baptiste Lamarck

What nature does in the course of long periods we do every day when we suddenly change the environment in which some…

— Jean-Baptiste Lamarck

Habits form a second nature.

— Jean-Baptiste Lamarck

In every animal which has not passed the limit of its development, a more frequent and continuous use of any organ gradually…

— Jean-Baptiste Lamarck

The form follows the function.

— Jean-Baptiste Lamarck

A sound Physics of the Earth should include all the primary considerations of the earth's atmosphere, of the characteristics and continual changes…

— Jean-Baptiste Lamarck

On our planet, all objects are subject to continual and inevitable changes which arise from the essential order of things. These changes…

— Jean-Baptiste Lamarck

All knowledge that is not the real product of observation, or of consequences deduced from observation, is entirely groundless and illusory.

— Jean-Baptiste Lamarck

“First Law In every animal which has not passed the limit of its development, a more frequent and continuous use of any…

— Jean-Baptiste Lamarck

All the acquisitions or losses wrought by nature on individuals, through the influence of the environment in which their race has long…

— Jean-Baptiste Lamarck

Now this circumscribed power, which we have scarcely examined, scarcely studied, this power to whose actions we nearly always attribute an intention…

— Jean-Baptiste Lamarck

It is not always the magnitude of the differences observed between species that must determine specific distinctions, but the constant preservation of…

— Jean-Baptiste Lamarck

However, if we consider that all the characteristics which have been cited are only differences in degree of structure, may we not…

— Jean-Baptiste Lamarck

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…

— Jean-Baptiste Lamarck

The thesis that the living creatures have always been composed different species was established in a time where no sufficient observations had…

— Jean-Baptiste Lamarck

Life, in a body whose order and state of affairs can make it manifest, is assuredly, as I have said, a real…

— Jean-Baptiste Lamarck

It is not enough to discover and prove a useful truth previously unknown, but that it is necessary also to be able…

— Jean-Baptiste Lamarck

The great age of the earth will appear greater to man when he understands the origin of living organisms and the reasons…

— Jean-Baptiste Lamarck