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We proceeded with the examination of the gases immediately on our return to London. The gases were transferred to a glass gasholder containing potash solution, and circulated over red-hot magnesium and copper oxide. The residual gas was pumped out of the circulating apparatus, and sparked with oxygen over potash to remove final traces of nitrogen.
Preliminary Spectroscopic Examination of the Gases.
Raillere.—Argon and helium, helium strong. Des (Eufs.—Argon, with less helium. Espagnol.—Argon, with helium ; the yellow and green helium lines very distinct, with jar and spark-gap. Caesar.—Argon, with a little helium. The tubes were carefully compared with normal argon and helium tubes, but no new lines could be detected. An attempt was made to separate the gas into its constituents by taking advantage of their relative solubilities. A measured quantity
