Abstract
DURING the last twenty years great progress has been made in the study of coal. Instead of treating it only as a material which on combustion gave certain products, investigators have been studying the material itself, its constituents, their mode of occurrence and association, and their probable method of origin. Coal is a rock rather than a mineral, and much of the progress that has been made has come from its examination by petro-logical methods. These methods have been developed independently in England, America, and Germany, and their results have been described in many widely scattered publications, consequently a brief summary of the work with a full list of references is very valuable.
Kohlenpetrographisches Praktikum.
Von Dr. Erich Stach. (Sammlung naturwissenschaftlicher Praktika, Band 14.) Pp. iv + 196. (Berlin: Gebrüder Borntraeger, 1928.) 10.80 gold marks.
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THOMAS, H. Geology and Mineralogy. Nature 123, 374–375 (1929). https://doi.org/10.1038/123374c0
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DOI: https://doi.org/10.1038/123374c0
