New vapor pressure measurements on -decane (268-490 K), n-elcosane (368-626 K), and n-octacosane (453-575 K) have been made with a modified ebulllometer and an inclined piston gauge. Benzene and water were the standards In the ebulliometric measurements on n-decane and n-eicosane, while n-decane was the standard for the measurements on n-octacosane. The high-quality data for n-decane, which were confirmed by a "third-law" analysis, suggest that reported literature data are In error. Similar concerns are raised about reported n-eicosane data. The vapor pressure data were regressed with the Cox equation, using as reference the normal boiling point.