Heat-capacity measurements have been made on UP and uP1.35 from 11 to 320°K and values of the standard thermodynamic functions are tabulated. The C ' curve for UP shows a pronounced, sharp anomaly at 22~5°K and also an expected anomaly at 121"K, which corresponds to antiferromagnetic ordering of the unpaired electrons at the N k l temperature. The origin of the former has not been established, although it may correspond to a transition in the electronic ground state. The entropy increments associated with these anomalies are S22.S0 = 0 4 5 cal deg.-1 mole-1 and S12p =
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