It is a well Known fact that the occurrence or origin of Bog Iron Ore in Hokkaido is quite different from that of Brown Iron Ore in Chosen. Starting from this Consideration, we have observed the heat quantity due to the decomposition of combined water (Warmetönung) by the method of Thermal Analysis for ores of Hokkaido and Chosen, and thus determined the foundamental difference on the property of grains consisting of both kinds of ores. The state of combined water and its decomposition temperature and also the sintering temperature were observed. The differences accompanied on these properties, or any other different nature or property between Bog Iron are and Brown Iron ore in Chosen will be easily explained by determining the "Wärmeönung" as above.

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Some years ago, the author has published on the foundamental investigation of the reduction of iron ores by hydrogen, on the Meiji Senmon Gakko Gahuho and the Journal of Iron and Steel Institute. In this investigation he made the experiment of reduction by hydrogen on the different kinds of ore, from 2, 000 to 5, 000 grams to investigate the properties of melted iron produced from the reduced iron. He determined proper temperature and time of the reduction in nearly industrial scale using the iron sands from Sanin and Kuji, and the iron ores from Taihei, Johole, Tochu, Ansan and the mill scales. The sponge iron after reduction was made as brickets under the pressure, 2 tons per square inch. From 1kg, to 1·5kg. of the brickets is melted in an electric resistance furnace made by carbon-tube and cast as ingot. The phenomena of the melting was observed, and the degree of the reduction of phospkorus and sulphur was estimated, also, the impurities in the iron was analysed.
The ingot iron obtained by the melting was forged after heating and compared the physical properties of the iron produced by different kind of ores
Generally, it is known, in the blast furnace working, that nearly all the phosphorous in the charge is reduced and goes into the pig iron and it is impossible to remove the phosphorous into the slag. But, in this e all the phosphorous is not reduced on account of low temperature of reduction and the ureduced phosphorous which exist as its oxide is removed in the slag during the melting. It is recognized that the degree of reduction changes by the temperature of reduction. To confirm this phenomena, the high phosphorous iron ores, Taihei and Johole is reduced in different temperatures between 600°C and 1, 100°C and investigated the phosphorous content in the iron and slag obtained by the melting of the sponge iron to observe the influence of the temperature on the reduction of phosphorous.

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