CARO, NIKODEM (1871— ), German chemist, was born May 23, 1871, at Lodz. He studied at Berlin University and at the technical high school, Charlottenburg, and founded a public chemical laboratory. He was engaged in agricultural research work, and experimented on peat as a source of power. He inter ested himself in the problems of calcium carbide and acetylene, and in the liquefaction of water gas for the production of hydro gen, also in ammonia oxidation. In conjunction with Frank, he devoted himself to the development of a process for the fixation of nitrogen (cyanamide) and organized the cyanamide industry founded thereon. Large works for this industry were also erected at Piesteritz and Chovzow. Dr. Caro made a special study of the question of Bavarian sources of water-power with a view to utilizing them in the chemical industry.