MULLER, JOHANN, one of the most eminent physiologists of the present century, was b. at Coblenz on July 14, 1801. He began to study with a view to orders in the Roman Catholic church; but in 1819 he abandoned his theological studies and devoted himself to medicine, taking, in 1822, the degree of doctor of medicine at Bonn. Whilst yet a student, he wrote for a prize the treatise De ilespiratione J'ietus (Leip. 1823). Ile became, in 1824, a tutor; in 1826, an extraordinary, and in 1830, an ordinary professor of physiology and anatomy at Bonn ; and in 1833 succeeded Rudolphi as professor of anat omy at Berlin:. His physiological researches were most industriously prosecuted, and were rewarded by many discoveries, which obtained for him a high reputation in the scientific world. lie died of apoplexy at Berlin, April 28, 1858. His works are numerous, and many of them occupied with particular topics in zoology and comparative anatomy. Among the most important are—Zur rergleichenden Physiologic des Ocsichtssinns des Menschen and der Thiere (Leip. 1826); Grundriss der Vorlesungen fiber die Physiologic
(Bonn, 1827); Grundriss der Vorlesungen fiber allgemeine Pathologic (Bonn, 1829; De Glan dulcirum Secernetium Structures Penitiori eat-moue prima Formatione in Homine atque Aninuzlibus (Leip. 1830): Ueber die organisehen Herren der ereetilen mannlichen GescIdecht sorgane, etc. (Berlin, 1835); and Handbuch der Physiologic des Menschen (2 vols. 4111 ed. Coblenz, 1851). "Manual of the Physiology of Man," which has been translated into French and English. lie was also the author of a large number of dissertions on a variety of subjects connected with physiology, the most important of which have been separately published. His latest investigations, on infusoria, were published in 1860. The most eminent living physiologists of Germany received their training in his school.