BRONN, HEINRICH GEORG German geologist, was born on March 3, 1800, at Ziegelhausen near Heidel berg. He took his degree as doctor of medicine at Heidelberg in 1821, and in the following year was appointed professor of natural history. His great work, Lethaea Geognostica (2 vols., Stutt gart, 1834-38; 3rd ed., with F. Romer, 3 vols., 1851-56), has been regarded as one of the foundations of German stratigraphical geology. Of his Handbuch einer Geschichte der Natur (1841 seq.), the third part included his famous Index Palaeontologicus. He died at Heidelberg on July 5, 1862.