separate article (see 5.60), in which the resultant mass broken up by Frobenius, Ankermann, Graebner, Rivers, W. Schmidt (Akad. Wiss., Wien, Mat.-Nat, Kl., 127-75, 1918), Chap- man (Quar. Jour. R. A. Lehfeldt’s National Resources of the total world demand. Switzerland was peculiarly vital. The difficultics