Cell Theory By BabiiGurlAmber Oct 10, 1595 Hans and Zacharias Janssen produced the first compound microscope by combining two convex lenses within a tube Sep 9, 1665 Robert Hooke discovered the cellular composition of cork and introduced the word cell to science Oct 9, 1674 Anton van Leeuwenhoek improved magnification of microscopes by polishing lenses Oct 9, 1676 Leeuwenhoek created "animacules" or should I say he discovered it. Dec 11, 1683 Leeuwenhoek discovered bacteria from a sample of saliva from his mouth Nov 12, 1838 Matthias Schleiden discovered the plants were made up of cells Oct 10, 1839 Schwann discovered that animals were made up of cells Oct 10, 1855 Rudolph Virchow stated that all living things come from other living things