Cells & Microscopes By raindrops_on_mars Jan 1, 1595 Hans & Zacharias Janssen create the first compound microscope Jan 1, 1665 Robert Hooke uses the word "cell" Jan 1, 1676 Anton van Leeuwenhoek discovers "animacules" (cells) Jan 1, 1683 Anton van Leeuwenhoek discovers bacteria Jan 1, 1838 Matthias Schleiden discovers that plants are made of cells Jan 1, 1839 Theodor Schwann discovers that animals are made of cells May 6, 1855 Rudolph Virchow says that all living things come from other living things Jan 1, 1931 Manfred Von Ardenne invents the first electron microscope