Mircoscope By Astatham Period: Jun 19, 1595 to Jun 19, 2012 Time Oct 3, 1595 The Mircoscope was invented by Zacharias Jansenn Jan 1, 1665 Robert Hooke discovered cells in a cork Jun 19, 1673 Anton van Leeuwenhoek made discoveries with a single-lends microscope Jan 1, 1674 Anton van Leeuwenhoek first person to see single cells called Protist Jun 19, 1683 Leeuwenhoek discovered Bacteria Jun 19, 1831 Robert Brown discovered cell nucleus Jun 19, 2012 Rudolph Koilker found muscle cells containing parts called Mitochondria