Abstract
It is generally agreed that no essential differences exist between the normal coal types and constituents of American and British Carboniferous coals. The brilliant bands of vitrain (anthraxylon) have been derived from fragments of cellular tissue, particularly the tissue of Bothrodendron, Lepidodendron, and Sigillarla, and also of wood tissues of gymnosperms and cycadophytes. Isolation of the various coal constituents and their examination petrologically and chemically is vital to investigations of rank and type variation. The importance of petrographic analysis to the economic and efficient utilization of coal is becoming increasingly apparent, as is also the petrographic examination of the mineral matter in coal seams in solving problems of preparation and treatment.
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