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1665 Robert Hook discovered dead tissue
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1670 Anton van Leeuwenhoek used his microscrope as lenses to look at pond water
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1683 Anton van Leeuwenhoek sent letter to royal about his discoveries first protozoa and bacteria discovered.
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1826 Pierre Turpin reported his observations of cell division
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1838 Matthias Jakob Schleiden stated first generalized about cells being the building blocks of matter
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1839 Theodor Schwann discovered animal tissue is composed of cells
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1840 Albrecht von Roelliker discoveres that sperm and eggs are also cells.
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1845 Carl Heinrich Braun stated that cells re the basic units of life
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1855 Rudolf Virchow discovered that cells are made from other existing cells
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1883 Robert Brown discovered Nucleus in plant cells