Reduction tests on pure titanic oxide with hydrogen, carbon monoxide and solid carbon within or without the stream of nitrogen gas were carried out under the same procedure.
At first, the author quoted the leading conclusions that have previously been proposed about this problem and gave a brief discussion.
The range of temperature of 400°-1, 200°C and 700°-1, 200°C was adopted respectively for the reduction in the case of hydrogen and carbon monoxide gases, and pure solid carbon. The pure carbon being prepared by the ignition of purified sugar carbon in the current of dry chlorine gas.
From the results obtained, it was shown that the reduction of precipitated titanic oxide began at above 400°C with hydrogen and carbon monoxide gases, and above 500°C with solid carbon. Higher the temperature of reduction and longer the duration, the higher Fercentage of reduction resulted. And the rate of reduction was retarded following to the order as C, H₂, CO in the higher temperature, H₂, CO, C in the lower and C, CO, H₂ in the intermediate. Among the varied physico chemical properties of the reduced products the formation of nitride was clearly observed. The colour of these products changes generally with respect to their reduction-gradients.
The author has also determined the any kinds of lower oxides to be produced and gave the suitable analylical procedure for their determination.

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In this paper the author proposes to discuss the production of non-porous iron castings which is attributed to the iron of hypo eutectic, metallographically, rather than eutectic.
He insists that sound dense castings without porosity or internal draw can naturally be obtained by the iron of hypo eutectic containing approximatelly equal proportion of primary austinite and eutectic. provided that is was cast on high temperature, the most satisfactory results being secured on the iron composed of some 40% of the former and 60% of the latter, This fact was proved by the auther mathematically and experimentally.

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Further data were given on "Chlumin" in this paper. The content is briefly summarized as follows:-
1. The effect of Fe, Cr, Mg on cast Aluminium was investigated respecting microscopic structure, corrosion, strength, elongation and fracture and it became clear that why "Chlumin" containing these elements has so excellent properties.
2. "Chlumin" was compared with various known light alloys in chill cast state. It has the largest impact resistance, 3 times as large as Silumin and from several to 10 times as large as Duralumin and Y-alloy. It is equal in hardness to Silumin. In high temperature strength it is a little inferior to Y-alloy but is stronger than any others and it has the largest elongation amounting to more than 20% at all temperatures, so it can be rolled or forged very easily at any temperature. In bending strength and angle it surpasses considerably any other ones such as Y-alloy. Silumin etc. It has the finest fracture like Aluminium.
3. Wires were immersed in various ways in salt and sea water and the decrease of strength and elongation due to corrosion were observed during one year. Duralumin corroded very much loosing both properties rapidly, while "Chlumin" and Aluminium remained very good.
4. Various articles have been cast commercially and used in success for several years Plates in commercial size were manufactured and are now used in practice.

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