This work concerns the spectroscopic vibrational study of the different polymorphic forms of cholesterol (anhydrous, monohydrate and form II) known in the literature in order to complete a program of vibrational researches on the structure and composition of gallstones. These three forms of cholesterol are distinguishable in i.r. spectra for the region of $\nu_{OH}$ stretching. In particular, the structure of the water in monohydrate cholesterol has been examined relatively to a recent x-ray study. The structure of the water in monohydrate cholesterol has a particular meaning in the study of this form of cholesterol in gallstones in relation to their formation and solubilization.
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