The present communication contains an outline of the recent progress of the science of iron, steel and other metals made in our country in a period of last six years, that is, from 1923 to the present year. The contents of the paper are divided into the following sections:
1. Research institutes and laboratories,
2. Methods of investigation,
3. Properties of iron and steel,
4. Properties of cast iron,
5. Equilibrium diagrams of ferrous alloys,
6. Equilibrium diagrams of non-ferrous alloys,
7. Mechanical properties of metals. and alloys,
8. Miscellaneous.

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The magnetic iron sands abundantly distributed in Japan are considered to be derived from the differentiations of igneous magma. The investigations on the micro-structure of the sand have been reported at several times by one of the authors since 1922, and in his opinion, they should belong mineralogically to the system of magnetite and ilmenite, and are chemically composed of ferrous, ferric and titanic oxides.
In this paper authors quoted the leading conclutions previously proposed on this system (about 130 literatures are refrred), and a brief discussion on the methods of melting and measurement of temperatures in given.
Chemical compounds or minerals known to the present time in this system are enumerated by 10, as shown in the following:-(1) Fe₂O₃ (2) Fe₃O₄ (3) FeTiO₃ (4) Fe₄Ti₃O₁₂ (5) Fe₂Ti₃O₉ (6) TiO₂ (7) Fe₂TiO₅ (8) FeTi₂O₃ (9) Fe₂TiO₄ (10) FeO
The results of the mineralogical. analyaes of 77 specimens of the component minerals such as ilmente, magnetite, hematite, arizonite, rutile, pseudo-brookite ete. are illustrated diagra-matically by the triangular coordinates; the variable compositions in their occurrences being clearly explained. Magnetite, ilmenite, hematite and their coexisting grains are the essential components of the iron sands; their summarized chemical compositions from about 100 localities vary from O to 20% of titanic oxide, 20 to 45% of ierrous oxide and 40 to 70% of ferric oxide.
The authors emphasise the facts that the solid solution certainly dominates the entire ranges of magnetite-ilmenite, magnetite-hematite and hematite-ilmenite systems, and the regular intergrowths between them are derived from so called" Entmischungs-umwandlung" at the lower temperatures.
-(Abstract)-

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