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    jean-baptiste lamarck Quotes

    The thesis that the living creatures have always been composed different species was established in a time where no sufficient observations had been made and when science hardly existed. This thesis is denied every day by those who have made accurate observations, who have long time observed nature and who have had the benefit from studying our musei's large and rich collections.
    — Jean-Baptiste Lamarck
    tags: time  nature  living 
     
    Now this circumscribed power, which we have scarcely examined, scarcely studied, this power to whose actions we nearly always attribute an intention and a goal, this power, finally, that always does necessarily the same things in the same circumstances and nevertheless does so many and such admirable ones, is what we call 'nature' .
    — Jean-Baptiste Lamarck
    tags: nature  power  action  goal 
     
    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 disuse of any organ; all these are preserved by reproduction to the new individuals which arise, provided that the acquired modifications are common to both sexes, or at least to the individuals which produce the young.
    — 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 power that gives rise to numerous phenomena. This power has, however, neither goal nor intention. It can do only what it does; it is only a set of acting causes, not a particular being. I was the first to establish this truth at a time when life was still thought to be a principle, an archeia, a being of some sort.
    — Jean-Baptiste Lamarck
    tags: time  truth  power  thoughts  body  real  goal 
     
    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.
    — 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 those differences in reproduction.
    — 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 suppose that this special condition of organization of man has been gradually acquired at the close of a long period of time, with the aid of circumstances which have proved favorable? What a subject for reflection for those who have the courage to enter into it!
    — Jean-Baptiste Lamarck
    tags: time  men  reflection  courage 
     
    Habits form a second nature.
    — Jean-Baptiste Lamarck
    tags: nature 
     
    One must believe that every living thing whatsoever must change insensibly in its organization and in its form... One must therefore never expect to find among living species all those which are found in the fossil state, and yet one may not assume that any species has really been lost or rendered extinct.
    — Jean-Baptiste Lamarck
    tags: living  believe  lost 
     
    All known living bodies are sharply divided into two special kingdoms, based upon the essential differences which distinguish animals from plants, and in spite of what has been said, I am convinced that these two kingdoms do not really merge into one another at any point.
    — Jean-Baptiste Lamarck
    tags: animals  living  body 
     
    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 particular structures. It is the habits and manner of life and the conditions in which its ancestors lived that have in the course of time fashioned its bodily form, its organs and qualities.
    — Jean-Baptiste Lamarck
    The form follows the function.
    — 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 species of living plant is situated.
    — 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 to propagate it and get it recognized.
    — Jean-Baptiste Lamarck
    tags: truth 
     
    All knowledge that is not the real product of observation, or of consequences deduced from observation, is entirely groundless and illusory.
    — Jean-Baptiste Lamarck
    tags: real  consequence 
     
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