Jo asked in Science & MathematicsBiology · 1 decade ago

Jean Baptise Lemark's Theory Of Evolution?

Im not sure how you spell the name, but what was his theory of evolution. And Also what was it called. Really Need To Know!. Thanks x

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Thanks! xo. :)

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  • 1 decade ago
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    Jean-Baptiste Pierre Antoine de Monet, Chevalier de la Marck, usually known as Lamarck, (1 August 1744 – 18 December 1829) was a French soldier, naturalist, academic and an early proponent of the idea that evolution occurred and proceeded in accordance with natural laws.

    People call his theory Lamarckism.

    Lamarck stressed two main themes in his biological work. 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 Floreal lecture 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).

    Lamarck employed several mechanisms as drivers of evolution, drawn from the common knowledge of his day and from his own belief in chemistry pre-Lavoisier. He used these mechanisms to explain the two forces he saw as comprising evolution; a force driving animals from simple to complex forms, and a force adapting animals to their local environments and differentiating them from each other. He believed that these forces must be explained as a necessary consequence of basic physical principles, favoring a materialistic attitude toward biology.

    Le pouvoir de la vie: The complexifying force

    Lamarck referred to a tendency for organisms to become more complex, moving 'up' a ladder of progress. He referred to this phenomenon as Le pouvoir de la vie or la force qui tend sans cesse à composer l'organisation (The force that perpetually tends to make order). Like many natural historians, Lamarck believed that organisms arose in their simplest forms via spontaneous generation.

    Lamarck ran against the modern chemistry promoted by Lavoisier (whose ideas he regarded with disdain), preferring to embrace a more traditional alchemical view of the elements as influenced primarily by earth, air, fire and water. He asserted that the natural movements of fluids in living organisms drove them toward ever greater levels of complexity:

    The rapid motion of fluids will etch canals between delicate tissues. Soon their flow will begin to vary, leading to the emergence of distinct organs. The fluids themselves, now more elaborate, will become more complex, engendering a greater variety of secretions and substances composing the organs.

    - Histoire naturelle des animaux sans vertebres, 1815.

    He argued that organisms thus moved from simple to complex in a steady, predictable way based on the fundamental physical principles of alchemy. In this view, simple organisms never disappeared because they were constantly being created by spontaneous generation in what has been described as a 'steady-state biology'. Lamarck saw spontaneous generation as being ongoing, with the simple organisms thus created being transmuted over time becoming more complex. He is sometimes regarded as believing in a teleological (goal-oriented) process where organisms became more perfect as they evolved, though as a materialist, he emphasized that these forces must originate necessarily from underlying physical principles.

    L'influence des circonstances: The adaptive force

    The second component of Lamarck's theory of evolution was the adaptation of organisms to their environment. This could move organisms upward from the ladder of progress into new and distinct forms with local adaptations. It could also drive organisms into evolutionary blind alleys, where the organism became so finely adapted that no further change could occur. Lamarck argued that this adaptive force was powered by the interaction of organisms with their environment, by the use and disuse of certain characteristics.

    First Law: 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 functional capacity, until it finally disappears".

    This first law says little except "an exaggerated generalization of the belief that exercise develops an organ".

    Second Law: All the acquisitions or losses wrought by nature on individuals, through the influence of the environment in which their race has long been placed, and hence through the influence of the predominant use or permanent di

    Source(s): Wiki
  • DrJ
    Lv 7
    1 decade ago

    Lamarck was a great French biologist. He coined the word "biology" and was the first to draw a classification tree.

    He believed that animals strived for perfection. That is called teleology today and is considered a fault in reasoning.

    Thus Lamarck believed animals tried to improve their lots. Giraffes would try to reach the highest leaves of a tree.

    Lamarck believed in "use and disuse".... that an animal could increase the proportion of a structure by continually using it.

    He also believed that acquired characters are inherited. He couldn't figure out how things were inherited, so arrived at this conclusion. We know today that the only thing inherited is the DNA in the sperm or egg.... not the muscle building of a weight lifter or the circumcised penis!!!

    But Lamarck was one of the first biologists who proposed a mechanism for evolution (change over time), although it did not meet the test of time. Darwin's theory overcame many of the problems of Lamarck's ideas, and then when modern genetics became known, it completed the main premises of evolutionary biology.

    Source(s): Emeritus Biology Professor
  • 1 decade ago

    It is spelled Lamarck, and I only know it as the Lamarckian Theory.

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