The History of Cell Biology By schobes2000 Jan 1, 1595 Jansen creates first compound microscope Jan 1, 1655 Hooke described "cell" in cork after viewing with microscope Jan 1, 1674 Leeeuwenhoek (var.) discovers single celled organisms: protozoa and bacteria Jan 1, 1833 Brown describes the cell nucleus in cells of the orchid. Jan 1, 1838 Schleiden and Schwann propose cell theory. Jan 1, 1857 Kolliker desribes mitochondria Jan 1, 1858 Rudolf Virchow puts forth his famous conclusion: omnis cellula e cellula or cells come from pre-existing cells Jan 1, 1898 Golgi discovers the golgi apparatus Jan 1, 1939 Siemens produced the first commercial transmission electron microscope Jan 1, 1998 Mice are cloned from somatic cells!!!