A search for a suitable solvent for extending the absorption curves of some organic compounds into the vacuum ultraviolet led to the discovery thatnhyphen;hexane andnhyphen;heptane give satisfactory transmission to 1700A, in 0.3hyphen;mm cells. The transmission limits of several solvents are given; and the absorption curves in this region are plotted for a number of organic compounds, showing especially the doublehyphen;bond peak at 1840A from octenehyphen;3. It is demonstrated that a fluorite spectrograph of the Cariohyphen;Schmitthyphen;Ott design is fast and convenient to use in such studies and is therefore well suited to routine quantitative analysis in this region (2500ndash;1700A) when low dispersion (20A/mm) is acceptable.
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