The author describes the characteristics of formation reaction in the prepar-ation of acetylene by the thermal cracking of methan, the technical development of Sachsse, Hills and Wulf methods, and considers the chemical engineering for this method.
At the industrial standpoint, he concludes for several problems the treatment of craked gas (separation and purification of acetylene, removal of carbon, sulfur and polyacetylene) and utilization of rest gas and diluted acetylene, and also considers economically for this method.

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The author represented Japan at the Steam Turbine Committee of the inter-national Electrotechnical Commission last summer and then inspected recent trends of power stations in England, Sweden, West Germany, West Berlin, France, Switzerland and Italy.
In this paper, recent trends of power stations in these European countries have been re-ported in detail.

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The writer has examined the interrelation between the variation of N/CT and that of volatile matters (VM), along with the interrelation between the variation of N/C and that of N/C and that of H/C and O/C of various coals.As a result, he has found and observed the facts as follows:
(1) Huck et al.claim that VM and N wt %have negative correlation to a certain degree of coalification, and then they come to bear positive correlation, and that coals can be clas-sified into two series according to the amount of N contained in their original matters.They are right on the whole.but in relation to some details, their assertion must be corrected.
(2) After he has examined the interrelation between N/C and VM of many kinds of coal obtained from all over the world, the writer believes that N-content in the original matters should not be classified into two series, but the secondary coalification starts from each point of indivisible variation stage.
(3) The difference among the N-content in the original matters as indicated by Huck et al.is in reality nothing but the difference brought about as a result of the primar coalific-ation, that is, the process of peat formation.
(4) In the primary coalification, N/C increases while VM., H/C, and O/C decrease.On the contrary, N/C bears positive correlation with the other three elements in peat and lignite individually.These facts show that the primary coalification is a complex process in which.more than two reactions take place.
(5) In the case of Japanese lignite, N/C of earthy lignite in remarkably higher than that of woody lignite.
(6) In the secondary coalification, the interrelation between N/C and VM can be divided into two diffeent groups as Huck et al.assert.The boundary between these groups in nearly at one with the distinctly curving part in“H/C-O/C coal band”.
(7) The chief variation in the lower rank of these two groups in the increase of N/C resulted by the split of oxygen groups.One can also discern the effects of the split of hy-drogen or hydrocarbon, too.In the coals belonging to this rank remains the positive cor-relation among N/C and H/C and O/C that can be seen in peat and lignite individuslly and so doing, complicates the variation of N/C.The lower the rank to which a coal belongs, .the more strongly this effect of positive correlation remains.
(8) The variation discerned in the higher rank is a consistent decrease of N/C accom panied by the progress of coalification.The more distinct and remarkable the effect of H/C on it, the higher the rank to which a coal belongs.Around the curving part of the“Coal” “band”above mentioned, the correlation between N/C and HC is ambiguous.
(9) The effect t of O/C appears at the early stage, and it is already conspicuous in the rank through which OH group in coals decreases.But, it tends to become weak and am-biguous if coalification advances further and the effect of H/C becomes stronger.

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