As a research tool of the constitution of coal the separations of Vitrit and Durit from the coal seams of Kayanuma and Ishikari coal fields were carried out by the microscopical examination, and their physical and chemical natures were studied.The relationships between these properties and the degrees of coalification as well as its mechanism were discussed.
In the beginning part of the paper, the author discussed in detail the fine struct-ures of Vitrit and Dtirit. Next, the author searched for the relation between the degrees of coalification of Vitrit and Durit in the coal seams which were seemed to be of the same degree of coalification and the equal content of carbon, oxygen and volatile matter, and found that there existed the transition point of coalifica-tion.This vas due to the existence of Lxinit which was deficient in carbon content but rich in volatile matter.With the progress of coalification, the content of moisture decreased, while the volatile matter and the brightness increased, the pe centages of hydrogen, nitrogen and sulphur showing no-remarkable diferences.
Thus, the author concluded that the carbon content in Vitrit might be used as a standard of the degree of coalification.
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