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Aristotle was known for his experimental approach and numerous dissections. He was drawn to animal classification in order to discover aspects of connection between the soul and the human body. Some of his animal classifications still stand today. One of his famous thoughts is a foreshadowing of Mendelian genetic concepts
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Janssen is credited with the creation of the first truly compound microscope.
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Jan Baptist van Helmont was believed to be the "founder of pneumatic chemistry." He conducted a five year experiment on plant growth and introduced to word "gas" into the vocabulary of scientists everywhere.
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His adult life comprised three distinct periods: as a scientific inquirer lacking money; achieving great wealth and standing through his reputation for hard work and scrupulous honesty following the great fire of 1666, but eventually becoming ill and party to jealous intellectual disputes
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Antonie van Leeuwenhoek, the Father of Microbiology, comes up with an improved microscope.
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This was the first book in a series by Lorenz Oken that established him as a leader in the movement of "Naturphilosophie" in Germany.
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Robert Brown, a Scottish botanist, was among the first to describe the cells nucleus in detail. He also was also the first to observe the Brownian Motion and was the first to recognize the difference between gymnosperms and angiosperms.
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Matthias studied in medicine, but he mainly focused on plant anatomy.
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Theodor Schwann helped develop the Cell Theory. One contribution is the discovery of Schwann cells in the peripheral nervous system. He discovered pepsin, made discoveries of the organic nature of yeast, and invented the term 'metabolism.'
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Roelliker became a proffesor of physiology and studied in the development of higher animals.
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Louis became a proffesor in chemistry. In 1879 he made his first vaccine discovery called chicken cholera.
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Robert Virchow discovered Cytopathology.
