Although soap is crystalline, little is known of the characteristics of soap crystals This paper records an x-ray and optical investigation of certain soaps which have been prepared in single crystal condition. These include the a form of the neutral sodium soaps, and the α and β forms of the 1:1 acid sodium soaps. The x-ray investigation was carried out by the new precession method of photographing the reciprocal lattice, which is especially adapted to the investigation of crystals with very large cell dimensions. The large cell dimension of soap crystals ranges in the neighborhood of 50 to 100 Å. All data are collected in Table 1.

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