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The air inside the Med Ship grew pungent; stinging; strangling. Murgatroyd sneezed. Calhoun coughed. The grid operator seemed about to choke. But in the white fog Calhoun cried exultantly: "Aromatic olefines! Acetone! Acetic acid radicals and methyl submolecular groups! And smoke has unsaturated hydrocarbon gases.
The other constituents of coal-gas methane, carbon monoxide, olefines, etc. are not affected by passing through boiling sulphur, and for ordinary laboratory work their removal is quite unnecessary, as they do not in any way interfere with the precipitation of metallic sulphides.
Marsh-gas, together with hydrogen and the monoxide of carbon, the last of which burns with the dull blue flame often seen at the surface of fires, particularly coke and charcoal fires, form about 87 per cent. of the whole volume of house-gas, and are none of them anything but poor illuminants. Others of the olefines are present in minute quantities.
"To break it down," said Calhoun bitterly, "I need aromatic olefines and some acetone, and acetic-acid radicals and methyl submolecular groups. To destroy it absolutely I need available unsaturated hydrocarbons they'll be gases! And it has to be kept from reforming as it's broken up, and I may need twenty different organic radicals available at the same time!
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