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A high-pressure gas chromatographic instrument has been used to measure the density dependent) solubility of Carbowax 4000, Carbowax 1000, 1-octadecanol, and stearic acid in compressed COZ at 40'. It is shown that maxima exist in all these solubility curves at between 300 and 2500 atm, depending on the solute. This result is consistent with a form of regular solution theory developed for dense gaseous solvents. A comparison of theory and experiment relative to a number of parameters shows generally excellent qualitative agreement and in some instances a quantitative predictability.

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A deuteron spin‐lattice relaxation study of the water‐dioxane system has been carried out. It was found that the deuteron relaxation results were in complete agreement with the conclusions derived from proton spin‐lattice relaxation studies, reported earlier, viz: the microdynamical environment of the dioxane molecule in dilute aqueous solutions is strongly concentration dependent and is closely related to the solution viscosity. It was also found that the quadrupole coupling constant of deuterated dioxane is concentration independent and has a value of 175 kHz and 171 kHz in pure dioxane and in infinitely dilute aqueous solution respectively.

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