PHYSICAL REVIEW LETTERS AUGUST 15, 1961 was made. v{0) was determined to be 58.096 Mc/ sec, corresponding to a field at the nucleus of 241 460 oersteds, a was (2.544± 0.067) xlO-^K"^2, b was (3.03 ± 1.04) xl0-5O K" y2 , and the mean square square deviation of the data points from the fit was 0.0016 Mc/sec. Inclusion of T 7/2 and T 4 terms does not significantly improve the fit. From a and b we calculate that J^ = 5.44°K and Jj = 0.88°K. The smallness of J\ relative to Jf, inferred from inspection of the superexchange "paths," is thus confirmed, and manifests itself in the magnetization curve as an unusually large T^2 term.
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