Marissa's Cell Theory Timeline By caudimar Oct 24, 1590 First Microscope made by Jenssen and Hans Oct 24, 1617 Hooke created reflecting teliscope Oct 24, 1644 Helmont Developed concept og gas Oct 24, 1664 Hooke said Jupitor rotates on axis Oct 24, 1673 leeuwenhoek created lens of Microscope Oct 24, 1816 Oken was Tittle of Honorary Doctor of Philosophy Oct 24, 1827 Made Professor of Physology at Munich Oct 24, 1836 Found substance responsible for digestion in the stomach found by Schwann Oct 24, 1838 Proposed Cell theory by Schwann Oct 24, 1838 Schleiden co-founder of cell theory Oct 24, 1840 Roelliker realized sperm and egg cells are also cells Oct 24, 1855 Virchow was first to recognize leukemia cells Oct 24, 1862 Pasteur invented boiling bacteria to get it removed Oct 24, 1865 Pasteur helped save silk industry Oct 24, 1939 sugar and starch as the results of life Schwannstudied yeast spores