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Two dutch scientists, Hans and Zacharias Janssen experimented with lenses. They put several lenses in a tube, the object near the end of the tube seemed to be enlarged. They invented the first compound microscope. 1655: Robert Hooke, the English father of microscopy, looked at a sliver of a cork through a microscope lens and noticed some pores or cells in it. -
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Robert Hooke, the English father of microscopy, looked at a sliver of a cork through a microscope lens and noticed some pores or cells in it. -
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Anthony Leeuwenhoek of Holland used the magnifying glass to count threads in woven cloth. By grinding and polishing, he was able to make small lenses with great curvatures.
These rounder lenses produced greater magnification, and his microscopes were able to magnify up to 270X. He saw bacteria, yeast, blood cells and many tiny animals swimming about in a drop of water. He is known as the "Father of Microscopy" -
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Schleiden preferred to study plant structure under the microscope.
While professor of botany at the University of Jena, he wrote “Contributions to Phytogenesis” (1838), in which he stated that the different parts of the plant organism are composed of cells or derivatives of cells. Thus, Schleiden became the first to formulate what was then an informal belief as a principle of biology -
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Theodore Schwann, he isolated a substance responsible for digestion in the stomach and named it pepsin, the first enzyme prepared from animal tissue. In it he extended to animals the cell theory that had been developed the year before for plants -
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Virchow is credited with several key discoveries. His most widely known scientific contribution is his cell theory, which built on the work of Theodor Schwann. The origin of cells was the division of pre-existing cells. He did not initially accept the evidence for cell division and believed that it occurs only in certain types of cells