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Louis Pasteur

How did Louis Pasteur disprove through his experiments the spontaneous generation theory?

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2012-03-05 00:58:15

In 1668, Italian physician Francesco Redi first performed tests

with rotting meat that showed that maggots did not form

spontaneously as was previously thought. It suggested that living

things could only be formed from living things of the same

type.

Louis Pasteur in 1861 improved upon the experiments of John

Needham, who in 1745 had suggested that living things could form

despite sterilization of the medium. Pasteur boiled solutions in

beakers that had necks shaped like an S, so that airborne

microorganisms could not reach the solution past the neck. Mold did

not appear in the unexposed liquid that was boiled, but did in the

solution that was exposed to bacteria from the air.


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