The idea of evolution had two broad attractions for social thinkers, wiz concerning its intellectual history, and the other concerning the political and social implications of its conclusions. In the reason category, evolution provided the relatively new subject of sociology with a track to find its feet, while lending the factually-based credibility of the natural sciences to social science. As for the specific conclusions which social thinkers drew from the concept of evolution, the biological conclusions of Darwin were employ - in the guise of Social Darwinism - to justify both empire-building and a leave out of provision for the poor.
It is worth beginning with an definition of what Darwin and Spencer understood as evolution, as it differs from the way in which we think about evolution now. Most theories of evolution at the time stemmed from Lamarck, who had arrived at some tentative conclusions many years forrader The decline of Species was published. Lamarck dismissed the concept of what we now know as genetics, and believed instead that characteristics acquired by organisms during their lives would be passed on to their offspring. This argument, which in the light of moderne study seems rather ridiculous, suggested for example that a blacksmiths muscles would be passed on to his children, or that an animal which was blinded in an accident before procreation would produce blind offspring.
Spencer continued to believe in this philosophy throughout his life, and drew some further conclusions which, with the modify knowledge of evolution that we now have, seem fallacious. He equated the outgrowth of an organism during its lifetime with the development of different types of organism through the ages, and paralleled this by equating the development of individual societies to the general successiveness of society. This philosophy falls apart if Lamarcks conclusion no long-term holds,
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