ON THE ASYMMETRICAL DISSOCIATION OF HUMAN HEMOGLOBIN.

SiZSjZ = '/2(S z + S;Z)2 1/4. (16) The last term on the right in equation (16) is constant and does not contribute to a zero-field splitting. The first term on the right in equation (16) annihilates P4 SO that only components of p antisymmetric in the space variables can contribute to the splitting. Similar remarks apply to the last term in braces in equation (13). The theorem is therefore demonstrated. * Sponsored by the Office of Ordnance Research, U.S. Army. t Alfred P. Sloan Fellow. Contribution No. 2425. 1 C. A. Hutchison, Jr., and B. W. Mangum, J. Chem. Phys., 29, 952, 1958. 2 A. Abragam and M. H. L. Pryce, Proc. Roy. Soc. (London) A, 205, 135, 1951.