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Aug 30, 1266
Roger Bacon
Used a convex lens as a magnifying glass -
Hans and Zacharias Janssen
constructed the first compound microscope using two lenses inside a tube. -
Robert Hooke
further developed comound microscope. -
Anton Van Leeuwenhoek
described unicellular organisms -
Leeuwenhoek
Discovered bacteria -
Robert Brown
Identified the nucleus -
Matthias Schleiden and Theodor Schwann
Formulated the cell theory that all living matter is composed of small units called cells. -
Rudold Virchow
'where a cell exists there must have been a pre-existing cell' -
Ernst Ruska
built first electron microscope
