I. Description of the five principal processes for the treatment of titaniferous iron ores
II. Treatment of crude sponge iron with diluted mineral acids to dissolve out iron and to leave titanium in residue.
III. Ditto with concentrated ferric chloride solution.
IV. Discussion on the possibility of ferric chloride-leaching in a commercial scale.
V. Summary.

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To obtain some alloy steels which can resist to the action of nonoxidizing acids such as HCl and H₂SO₄, several special elements were added to the 0.2% C steel. Cu, Ni, Mo and W were selected as the adding elements, because these elements increase the resistance of steel to the above mentioned acids and comparatively cheap. These elements were added to the 0.2% C steel individually or combined 2, 3 or 4 together. The weight decreases in 10% HCl, H₂SO₄, conc. HCl (at room temperature respectively) and 30% H₂SO₄ (at 80°C) were determined concerning about 170 specimens.
The results obtained are summarized as follows.
In the case of 10% acid solutions; 1. When the elements are added individually, Cu, Mo and W give. a remarkable rise of acid-resistance in their small addition and nearly no effect more than 1% addition, while the rise of acid-resistance by Ni is very gradual and the effect of 10% Ni is equal to that of 0.25% Cu, 2. In the combination of 2 adding elements many excellent alloys were found in Fe-Cu-Ni system but no promising alloys in Fe-Cu-Mo, Fe-Cu-W, Fe-Ni-Mo, Fe-Ni-W and Fe-Mo-W system, only the steels containing appreciate amount of Cu or Ni and small quantity of Mo or W are resistant to HCl, 3. In the combination of 3 adding elements the alloys of Fe-Cu-Ni system become more resistant to HCl by the addition of small amount of Mo or W but not to H₂SO₄. 4. Finally the auther recommend the following alloy steels as most resistant materials, low C steel containing 3-5% Cu, 10-15% Ni, 0.5% Mo and W respectively for dil. or medium conc. HCl and that containing 5% Cu, 15% Ni and 2-3% Mo for dil. or medium conc. H₂SO₄.
In the case of conc. HCl and hot 30% H₂SO₄ a very low C steel was used as the ground material, the alloy steel containing 30% Ni, 5% Cu, Mo and W respectively is most resistand to conc. HCl and that containing 30% Ni, 5% Cu and 3% Mo to hot 30% H₂SO₄.
Moreover these acid resisting alloy steels were compared with monel metal, nichrome and 18-8 Cr-Ni steel by immersing them in acids of various conc. for 30 days and proved their superiority to the latters.

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This is a supplementary work of the report which was presented by the author and Daikichi Saito at the Autumn Meeting of the Iron and Steel Institute of Japan, 1930, and published in that Journal. 5 (1931) 502. In measuring the viscosity of cast iron, the carbon content of each group was not constant in one another, and, therefore, we made experiments to complete them in two systems of 3.0% and 3.5% carbon. The difference of carbon contents gives a little effect on the vescosity change by increasing the quantities of each ingredients, i.e. the improving influences on viscosity by phosphorus, silicon and manganese are a little greater in carbon 35% than in carbon 3% but on the contrary sulpher which injures the viscosity of cast iron gives a smaller influence in carbon 3.5% than in carbon 3%

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In the foundry practice, it is generally percieved to get a good surfaced casting, if the hydrostatic pressure of molten metal and the internal pressure in the sand core are balanced each other on the surface of the core after teeming melt.
To see this relation, the auther tried to determine the internal pressure in the small different sized cores included some kinds of core binder and some other combustible substances, like Kordeck, soybeanoil, coal powder and ricebran, after teeming melt by means of an experiment and a theoretical calculation. And then obtained experimentally an interesting relation between the hydrostatic pressure of molen metal and the internal pressure in the core.

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