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Measurements of the magnetic susceptibility of very dilute solid solutions of He 4 in He 3 as a function both of molar volume and of He 4 concentration in the a phase have been made between 1 and 0.04°K by steady-state nuclear-resonance techniques. The most dilute solution (5xio~7 He 4 ) followed Curie's law over the range in molar volume (23.0-21.0 cc) measured. The less dilute solutions (lxlO" 4 and 3xl0~4 He 4 ) followed a Curie-Weiss law with relatively large, antiferromagnetic Weiss constants.

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