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Earliest date of a claimed of the compound microscope
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Earliest date of a claimed Hans/Zacharias Janssen invention of the compound microscope.
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He publishes Micrographia, a collection of biological micrographs. The word cell was coined.
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Improvement on a simple microscope for viewing biological specimens.
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He concluded that all plant tissues are composed of cells. He declared that the cell is the basic building block of all plant matter.
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Coinage of the term "metabolism". It is the processes that occur within a living organism in order to maintain a state of life.
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Virchow has several important discoveries. His most widely known scientific contribution is his cell theory, which was based on Schwann's work.