[Short Reviews]

Abstract

IN attempting a detailed study of the magnetic properties of all the elements, particularly in relation to their relative abundance in the earth's crust, in the hope of being able to throw light upon the process of their evolution, the author of this essay has gone to considerable trouble in drawing up an elaborate set of tables, in which a number of physical constants of the various elements are arranged not only in the order of atomic numbers but also in order of magnitude. The Thomsen-Bohr arrangement of the elements is given in Table 1 for reference. Table 2 contains some new features in the familiar scheme of 18 groups and 8 periods. Thus, instead of atomic weights, the following values are inserted: atomic number, electrical resistance, magnetic susceptibility, density and melting point, whilst dia- and para-magnetio properties are indicated by means of shading. The peculiar character of oxygen, which is strongly paramagnetic in itself, though diamagnetic in many of its compounds, is denoted by striped shading.

Das periodische System in neuer Anordnung: mit Tabellen über Fünfzehn pkysikalische Konstanten in Anordnung nach der Ordnungszahl der Ele-mente und nach der Grösse der Konstanten.

Von Dr. Darwin 0. Lyon. Zweite Auflage. Pp. vi + 40 + 4 Tafeln + 23 Kurven. (Leipzig und Wien: Franz Deuticke, 1931.) 8 gold marks.