Julius Adolf Stockhardt, a German chemist, born at Rohrs-dorf, Saxony, Jan. 4, 1809. After serving in a pharmacy, he taught natural sciences at Dresden in 1838-'9, afterward at Chemnitz till 1847, and in 1848 was called to the new chair of agricultural chemistry in the academy of Tharand. In 1844 he began a course of lectures before the Chemnitz agricultural society, which led to the establishment of the system of agricultural experimental stations. From 1846 to 1849 he edited Das polytechnische Centralblatt, and from 1850 to 1855 (with Schober), Die Zeitschirift fur deutsche Landwirthe; and in 1855 he established at Berlin Der chemisclie Ackersmann, in which are published his familiar lectures before farmers' clubs and societies, which he calls " field sermons.'1 It is said that the yield of grain in Saxony has been doubled chiefly through his efforts. His principal works are: Untersuchung der zwickauer Steinkohlen (1840); Ueher Erlcennung und Atiwendung der Giftfarbe (1844); Schule der Cliemie (1846; 17th ed., 1873; English translation by G. H. Pence, M. D., "The Principles of Chemistry illustrated by Simple Experiments," Cambridge, Mass., 1850; also by A. Henfrey, London, 1855); Guanobilchlein (1851); and Chemisclie Feld-predigten (1851; English translation by J. E. Teschemacher, "Chemical Field Lectures for Agriculturists," Cambridge, Mass., 1853).