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The sample was introduced into the evacuated and outgassed isoteniscope and outgassed to constant vapor pressure at 20°t hrough a bypass which was later sealed off. Mercury was used in the U-tube rather than the liquid under investigation because of the high solubility of the latter in all of the common stopcock greases. Both the mercury levels in the U-tube and in the mercury manometer were observed by means of a cathetometer to ±0.1 mm. The temperature was obtained by means of a rapidly stirred water bath, which was contained in a clear-walled Dewar flask and was observed by means of an Anschutz melting point thermometer to ±0.1°.Melting points. The melting points listed in Table II were determined by suspending samples sealed in evacuated pyrex tubes of about 5 mm. o.d. and 15 cm. long in a rapidly stirred (9) A. Weissberger, Physical Methods of Organic Chemis-

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