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How would you describe what you see below to someone else? Robert Hooke 1665 • Viewed “cork” slices under the microscope •Described what he saw as a “cell” Anton von Leeuwenhoek (1667) • Looked at pond water under the microscope • Discovered “animalcules” Henry Dutrochet Early 1800’s • All living things are made of cells Robert Brown 1831 • Discovered the nucleus Matthias Schleiden 1838 Viewed plant cells under the microscope Theodor Schwann 1839 Viewed animal cells under the microscope Johannes Purkinje 1839 • Discovered cell “jelly” cytoplasm Rudolph Virchow 1855 Cells divide to become other cells Max Schultze 1861 •All cells have cytoplasm Felix Dujardin 1861 •Discovery of one-celled organisms