With the Ostwald's viscosimeter viscosity measurements were made on brines (concentrated sea water) of concentrations Bé 4.97°, 11.33°, 17.83°, and 22.65°. Temperature range was from 20° to 90°C. The experimental formula φ=1/η=a+bt+ct² was verified to fit well for interpolation and extrapolation to some higher temperatures. Based on this fact, tables of viscosity η and relative viscoity η/ηω were made by interpolation and extrapolation for temperatures from 20° to 120°C and for concentrations from Bé 1° to 24°. The relative viscosities varied only 2-3% in the temperature range concerned.

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The purpose of this investigation is to discriminate the differences in the physical proprties of magnesium hydroxides obtained by the different preparing processes, using the Debye-Scherrer's method of X-ray.
The methods used for the preparations of magnesium hydroxides are as follows:-the reactions of magnesium salts and alkalies, the reactions of water and magnesium oxide which is made by calcining magnesite or by burning metallic magnesium.
As a result of this investigation we cannot find any difference in the diffraction rings appeared on the films, excepting distribution of the intensity.
The distances of planes oftained by Bragg's equation () and their indices determined by Hull-diagram for hexagonal system are as follows:
we think that the difference of distribution of the intensity deponds upon the form and size of the crystal particles.
the Axial ratio of these magnesium hydroxides was similartto that of natural Brucite, too.

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For the purpose of recovering effectively Be⁺⁺ which was used for SO₄^- removal, the dissolution of Barium Sulfate by the mixed Ion Exchange Resins was examined.
For the Cation Exchange Resins, Styrene-Divinylbenzene type strongly acidic Resins of H form (Ca or NH₄) were used, and for the Anion Exchange Resins, strongly basic Resins, Amberlite IRA-410, of HCO₃ form which was able to be regenerated easily, were used.
Between the Cations, H⁺ was most useful in point of exchange capacity and Ba⁺⁺ recovery.
When HR (100c. c. as NaR) and RHCO₃ (100c. c. as RCl) were mixed with BaSO₄ precipitates and were heated at 80°C with water bath for 4hr, about 17.6g (150mE) of BaSO₄ was dissolved perfectly.
As the mixed Resins could be separated by the difference of specific gravty, it was examined that the Cation Resins were regenerated with HCl and Ba⁺⁺ was recovered as BaCl₂ and the Anion Resins were regenerated with NH₄HCO₃ and SO^- was recovered as (NH₄)₄ SO₄.

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The transpareney of various kinds of basic magnesium carbonate obtained by different procedure was examined and compared with their Xray diffraction patterns.
As the result of this examination, it was recognized that the transparency decreased according to intermixture of other magnesium compound such as normal magnesium carbonate or magnesium hydroxide. For improving the transparency, the influences of aging, addition of alkali solution and etc were examined and at present the most transpareut product was obtained by means of addition of NaOH into the suspension of normal magnesium carbonate.

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Saturate vopour pressures of sea water brines at different concentrations are measured by a statical method. The apparatus used is similar to a vapaur pressure thermometer. Saturate vapaur pressure of pure water is also measured simultaneausly, as a check of the rasult.

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