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The visual data of Vaughan & Donohue (1952) for urea have been used in a three-dimensional least-squares refinement of the positional and thermal parameters. The results are in excellent agreement with the partial refinement of Sklar, Senko & Post (1961) of their zonal spectrometer data.The results include the following bond lengths, corrected for libration: C-O = 1-276 +_ 8 and C-N 1.356 + 7 A; thermal vibration ellipsoids and the components of the T and co tensors in a rigid-body analysis are also presented: the r.m.s, libration of the molecule about its twofold axis is 13 °.

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