Historical Scientists By Graysan.Martin Aug 6, 1553 Griolamo Fracastoro Girolamo Fracastoro is known for stating that diseases were transfered through direct and indirect contact. He also stated that diseases could be spread without contact over a long distance. Feb 18, 1626 Francesco Redi Francesco Redi was known for proving that spontaneous generation did not exist, and that maggots found on dead animals were hatched from eggs left by flies. Oct 24, 1632 Anton van Leeuwenhoek Anton van Leeuwenhoek is known for being the first scientist to observe and describe microorganisms. Sep 10, 1713 John Needham John Needham is known for supprting the Spontaneous Generation theory. Jan 10, 1729 Lazarro Spallanzani Lazarro Spallanzani was known for being the first to prefrom an In Vtro fertilization, and discovering that mammals need semen and ovum to reproduce. May 17, 1749 Edward Jenner Edward Jenner created the small pox vaccine. Dec 7, 1810 Teodor Schwann Theodor Schwann was known for discovering Pepsin, which is a digestive enzyme. He also exteneded Matthias Schleiden's cell theory to include animals and all living things. Jul 1, 1818 Ignaz Semmelweiss Ignaz Semmelweiss created hand washing standards for doctors hadling pregnancies and womens reproductive systems. Aug 2, 1820 John Tyndall John Tyndall is known for the Tyndall Effect. The Tyndall Effect is used to determine the size and density of particles. Aug 2, 1820 John Tyndall John Tyndall discovered that water vapor is the most important gas for controlling the Earths temperature. Dec 27, 1822 Louis Pasteur Louis Pasteur created Pasteuization which slows down the rate a food spoils. Sep 17, 1824 Theodor von Dusch Theodor von Dusch is known for creating a filter that could remove bacteria from the air. Apr 5, 1827 Joseph Lister Joseph Lister came up with the idea to use Carbloic acid to sterilize wounds and medical equipment to make surgery safer for patients. Dec 11, 1843 Robert Koch Robert koch is known for discovering bacteriology and Kochs Postulates Mar 12, 1851 Charles Chamberland Charles Chamberland is known for creating the Chamberland Filter which completely filtered out bacteria. Jan 1, 1885 Louis Pasteur Louis Pasteur created vaccines for rabies and anthrax, which has saved countless lives. Feb 1, 1944 Oswald T. Avery, Colin M. MacLeod, Maclyn McCarthy These scientists discovered that DNA causes bacterial transformation. Mar 2, 2022 Aristotle Aristotle is known for creating the Scientific Method.