About 1850, Louis Pasteur began experimenting with tiny living organisms and was able to discover many important things. He proved that yeast plants cause substances to ferment, that bacteria cause milk to sour, and that floating particles in the air contain living germs which cause spoiling and decay.
Soon after Pasteur had announced these discoveries, Joseph Lister proved that wounds were poisoned by germs from the air or from the surgeons instruments used during operations. He proved that if the instruments were perfectly clean or sterile and if antiseptic dressings were used on wounds to prevent the entrance of germs, wounds would heal without decay or blood poisoning. The first antiseptic Lister used was carbolic acid. The wards in the Glasgow infirmary of which Lister had charge were especially affected by gangrene . In a short time they became the healthiest of any known, because he applied his knowledge of antiseptics to the healing of wounds. With some improvements, Listers methods are used today.
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