It is not always the magnitude of the differences observed between species that must determine specific distinctions, but the constant preservation of those differences in reproduction. — Jean-Baptiste Lamarck Copy Share Image
One must believe that every living thing whatsoever must change insensibly in its organization and in its form... One must therefore never expect to… — Jean-Baptiste Lamarck Copy Share Image
All known living bodies are sharply divided into two special kingdoms, based upon the essential differences which distinguish animals from plants, and in spite… — Jean-Baptiste Lamarck Copy Share Image
After having produced aquatic animals of all ranks and having caused extensive variations in them by the different environments provided by the waters, nature led them little by little to the habit of living in the air, first by the water's edge and afterwards on all the dry parts of the globe. These animals have in course of time been… — Jean-Baptiste Lamarck Copy Share
What nature does in the course of long periods we do every day when we suddenly change the environment in which some species of… — Jean-Baptiste Lamarck Copy Share Image
In every animal which has not passed the limit of its development, a more frequent and continuous use of any organ gradually strengthens, develops and enlarges that organ, and gives it a power proportional to the length of time it has been so used; while the permanent disuse of any organ imperceptibly weakens and deteriorates it, and progressively diminishes its… — Jean-Baptiste Lamarck Copy Share
A sound Physics of the Earth should include all the primary considerations of the earth's atmosphere, of the characteristics and continual changes of the earth's external crust, and finally of the origin and development of living organisms. These considerations naturally divide the physics of the earth into three essential parts, the first being a theory of the atmosphere, or Meteorology,… — Jean-Baptiste Lamarck Copy Share
On our planet, all objects are subject to continual and inevitable changes which arise from the essential order of things. These changes take place… — Jean-Baptiste Lamarck Copy Share Image
All knowledge that is not the real product of observation, or of consequences deduced from observation, is entirely groundless and illusory. — Jean-Baptiste Lamarck Copy Share Image
“First Law 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 Copy Share Image
All the acquisitions or losses wrought by nature on individuals, through the influence of the environment in which their race has long been placed,… — Jean-Baptiste Lamarck Copy Share Image
