vapor phases of the sample, the experimental tube was provided with a stirrer, consisting of a small rod of soft iron about 0.75 inch (1.9 cm.) long and of dumb-bell shape. The stirrer was moved by means'of an electromagnet outside the apparatus.

Referring to Fig. 1, this ratio ~will be constant along lines This paper compiles data from various sources in the literature on the vapor pressures, heats of vaporization, densities, critical constants, and specific heats of the normal paraffin hydrocarbons. These data are then treated theoretically with the aid of thermodynamics, the laws of corresponding states, and similar relationships, to choose between discrepant data, to fill in gaps, and to extrapolate to higher temperatures and to compounds of higher molecular weight. This results in giving a fairly complete set of approximate values for the more important physical constants for all the hydrocarbons from butane to tetracosane. The method of applying these results to actual refinery cuts is also discussed.

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