The writer has tried an essay on the basis of his 6 reports bearing the same title as this.The contents of the essay are summed up as follow:
1) He points out the usual defect of slipping from the cognition that the reactions of, coal are chemical reactions, and claims to be necessary, for the first step of correcting the above defect, to indicate the ultimate analytical values of coal not by weight % but by atomic ratios.
2) He points out that every analytical value on coal is only statistically true, and claims to be necessary to treat the data on coals with special methods as stastics owing to the particularity of their actural distribution.
3) He suggests that the new idea“coal series” is useful for the distinction of coal kinds.“Coal series”is the rough classification of coals by the location and the geological age of coal seams.
4) He points out the usual defect of adopting the coal properties as the indexes for its classification, and claims, on the basis of (1), that a new classification has to be denoted with 2 indexes of [H] and [O].
5) He explains with examples how the results of his studies can be used in coal chemical industries, i, e, carbonization, hydrogenation, gasification, etc.
6) He gives his several views about coalification on the basis of his studies, in which he clears that each of peat formation, huminification and dynamochemical metamorphism is its own reactions, and then the kinds of gas held in coal seams affect the dynamoch-emical metamorphism of the coal with their pressure.
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