cell theory By poppysunshine11 Jan 1, 1590 invention of the microscope by hans janssen Jan 1, 1663 robert hooke sees cells in a cork, the cells looked like rooms (aka:cells) sees cells in a cork, the cells looked like rectangular rooms (aka:cells) Jan 1, 1690 anton von leeuwenhoek sees bacteria and calls it "animalcules" Jan 1, 1838 Mathias schleiden says that all plants are made of cells Jan 1, 1839 todore schwann says all animals are made up of cells Jan 1, 1855 ruldolf virchow all cells come from cells