The chemical and geological relations of the atmosphere

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Abstract
QUESTIONS conceming the condition of the terrestrial atmosphere in former periods of the earth's history, and its geological relations, have occupied the attention of naturalists, physicists and chemists.Bronguiart long since suggested that the abundant vegetation of the Coal-period indicated the existence of a large proportion of carbonic acid in the air at that time.Ebelmen, however, appears to have been the first to clearly understand the great geological significance of the atmosphere, and in his two remarkable memoirs on the decomposition of rocks, published in the Annales des Mines in 1845 and 1847,t treated the subject in its atmospheric relations with• much research and philosophic breadth.Starting from the chemical changes of crystalline,silicate rocks, he considered both the conversion of feldspars into kaolin, and the decay of protoxide-silicates, such as amphibole and olivine.The sub-aerial decomposition of the feldspars had already been shown by Bel•thier to result in the separation, in a soluble form, of the pro~oxide-bases, together with a portion of silica, from an insoluble aluminous silicate of definite composition.The analyses of Ebelmen now established the fact that the protoxide-silicates just mentioned, lose, under similar conditions, the whole of their lime and magnesia, and nearly the whole of their silica, leaving little behind save the higher oxides resulti'ng from the fixation of atmospheric oxygen by the ferrous and manganous oxi:les of the silicates; * A summary of the views presented in this memoir was given at Dublin, in
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openalex_W2316780346 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors T. Sterry Hunt
Journal american journal of science
Year 1880
DOI
10.2475/ajs.s3-19.113.349
URL
https://doi.org/10.2475/ajs.s3-19.113.349
Keywords Keywords not found

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