Gnstav Theodor Fechner, a German naturalist, born at Gross-Sahrchen, Lusatia, April 19, 1801. He studied at the university of Leipsic, and was professor of physics there from 1834 to 1839, when a disease of the eves disabled him from teaching, and he devoted himself especially to anthropology and natural philosophy. He had early attracted attention by researches in galvanism, by translations of French scientific works, by papers relating to chemistry and pharmacy, and by humorous writings, Stapelia mixta, which he published in 1824 under the name of Dr. Mises. In his Beweis, (lass der Mond aus Jodine bestehe (2d ed., 1832) he deals with scientific problems in a humorous vein. His Buchlein vom Leben nach dem Tode (1836), Gedichte (1842), and Bath- selbachlein (3d ed., 1865) contain admirable spe- cimens of poetry. His other principal works are: Nanna, oder uber das Seelenlebender Pflan- zen (1848); Zend-Avesta, oder uber die Dinge des Himmels und des Jenseits (3 vols., 1851); Elemente der Psychophysik, his most im- portant scientific work (2 vols., 1860); and Physikalische undphilosophische Atomenlehre (2d ed., 1864).