Cell Theory Time line By happywheels123 Jan 1, 1590 Zacharias makes the first microscope Period: Sep 20, 1595 to Aug 18, 1855 cell theory Jan 1, 1658 Robert Hooke makes the air pump Jan 1, 1674 leeuwenhoek improved microscope lenses Jan 1, 1838 mathias shlieden discovered plants were made of cells Jan 1, 1839 theodor shwann discovered animals were made upof cells Jan 1, 1855 rudolph virchow stated that all things come frome other things
