Jean Baptiste Lamarck (1744-1829)

The first was that the environment gives rise to changes in animals. He cited examples of blindness in moles, the presence of teeth in mammals and the absence of teeth in birds as evidence of this principle. The second principle was that life was structured in an orderly manner and that many different parts of all bodies make it possible for the organic movements of animals.

Although he was not the first thinker to advocate organic evolution, he was the first to develop a truly coherent evolutionary theory. He outlined his theories regarding evolution first in his Floreallecture of 1800, and then in three later published works:

• Recherches sur l'organisation des corps vivants, 1802.
• Philosophie Zoologique, 1809.
• Histoire naturelle des animaux sans vertèbres, (in seven volumes, 1815–1822).

Source

By.Jose Manuel Vázquez