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 1395.    HEISENBERG, W.  [Theory of Ferromagnetism.]  Ztschr. Physik, vol. 49, 1928, pp. 619-636; Chem. Abs., vol. 22, 1928, p. 4348.

       An attempt to explain the Weiss molecular field on the basis of a quantum mechanics energy-interchange process similar to that recently applied by Heitler and London to the interpretation of homopolar valence forces.  According to this, ferromagnetism is possible only when (1) the lattice is such that each atom has at least 8 neighbors, and (2) the principal quantum number of the electrons responsible for the magnetism must be ≤23.  These conditions together do not serve to distinguish Fe, Ni, and Co from all the other materials but Fe, Ni, and Co satisfy these conditions.  The present paper is, therefore, regarded by Heisenberg as preliminary and further development is promised.