Spontaneous Generation

  • 400

    Beginning of the spontaneous generation

    Beginning of the spontaneous generation
    The birth of the Spontaneous generation started when Aristotle argued that spontaneous generation was on of the four means of reproduction in 400 BC, with The History of Animals. He explained that how there were animals that came from parent animals and others that grew spontaneously from inanimate objects
  • Oct 10, 1225

    THe first time that the Medival Church accepts spontaneous generation

    THe first time that the Medival Church accepts spontaneous generation
    St. Thomas Aquinas announces that the exact machine of spontaneous generation is that " it was all done by angels acting through the agency of the sun"
  • First assault on the concept

    First assault on the concept
    An Itialian physician, Francesco Redi conducted an experiment to test spontaneous generation. He placed meat in various flasks, some open to air, some with a gauze and some completely sealed. He found that only the ones that allowed air to get to the meat had maggots growing in the meat. He believed he disproved spontaneous generation; however, the general public still believed in the theory.
  • Microscope

    During the later 1600's, smaller microorganisms were found because of the development of the microscope. These microorganisms were never thought to exist before, but they were associated with things like spoiled broth or meat. Spontaneous generation was used as the explanation for these organism's sources because they seemed to come from nowhere.
  • Defence of the spontaneous generation

    In 1745, John Needham, an English clergyman, attempted to prove once an for all the validity of spontaneous generation. Everyone knew that boiling killed microorganisms, so he proposed to test whether or not microorganisms appeared spontaneously after boiling. He boiled chicken broth, put it into a flask, sealed it, and waited. Microorganisms grew and he thought he had won the battle in support of spontaneous generation.
  • the rest of Spontaneous generation

    The French Academy of Sciences sponsored a contest for the best experiment either proving or disproving spontaneous generation. He boiled meat broth in a flask, heated the neck of the flask in a flame until it became pliable, and bent it into the shape of an S. Air could enter the flask, but airborne microorganisms could not - As Pasteur had expected, no microorganism grew and the rest is history.
  • Biogenesis and Abiogenesis lecture

    Thomas H. Huxley gives his "Biogenesis and Abiogenesis" lecture. The speech offered powerful support for Pasteur's claim to have experimentally disproved spontaneous generation.