Georg Ernst Stahl

Georg Ernst Stahl and the Phlogiston Theory

Georg Ernst Stahl and the Phlogiston Theory

On October 22, 1659, German chemist, physician and philosopher Georg Ernst Stahl was born. Stahl developed the phlogiston theory of combustion and of such related biological processes as respiration, fermentation, and decay. Combustible objects, he said, were rich in phlogiston, and during combustion is lost. The remaining ash, now having no phlogiston, could no longer burn. Until the late 18th century his works on phlogiston were accepted as an explanation for chemical…
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Johann Joachim Becher and the Phlogiston Theory of Combustion

Johann Joachim Becher and the Phlogiston Theory of Combustion

On May 6, 1636, German physician, alchemist, precursor of chemistry, scholar and adventurer Johann Joachim Becher was born. He is best known for his development of the phlogiston theory of combustion, in which all flammable objects were supposed to contain a substance which was released when the object burned, and his advancement of Austrian cameralism. “The chemists are a strange class of mortals, impelled by an almost insane impulse to seek their…
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Dorothea Erxleben – Germany’s First Female Medical Doctor

Dorothea Erxleben – Germany’s First Female Medical Doctor

On November 13, 1715, Dorothea Christiane Erxleben, first female medical doctor in Germany was born. It was very hard for her to overcome the prejudices of the University professors and to finish her studies with a proper examination. What is even worse is that it should take until 1901 that the second woman in Germany was able to make her exams as a doctor. Dorothea Leporin – Youth and Education Dorothea Leporin was born as…
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Carl Wilhelm Scheele and the Discovery of Oxygen

Carl Wilhelm Scheele and the Discovery of Oxygen

On December 19, 1742 (Gregorian Calendar), Swedish Pomeranian pharmaceutical chemist Carl Wilhelm Scheele was born. Scheele is best known for his discovery of oxygen and other chemical elements. Early Years Carl Wilhelm Scheele was born in Stralsund, which was back then under the control of Sweden, but belongs to Germany on this day. During his childhood, friends of the family taught him reading prescriptions and equipped him with further chemical knowledge. At the…
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