At the “Matsuzaki” salt field the auther surveyed the level of the field and determined the soluble constituents of ground water and soils. the results are summarized as follow.
1. The Y. P. of this salt field is 85 cm, higher than normal.
2. The difference of level between North and South is comparatively great.
3. Water containing none of salt is invading under the ground from South-West to the center of this field.
4. Sea water which penetrate under the dyke does not affect at the distance far from the center of the field.
5. The construction of the ground consists of 3 layers, the 1st the-surface the 2nd the oxidized and the 3 rd the natural layer.
6. The local difference of the sa/t contents of the ground soils did not exist and the rapid decrease of salt content with the deepth was observed at the center area.

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As descrived on the previous paper, the authors succeeded to prepare Mg (OH)₂ for compounding material of rubber with the same transparency as basic magnesium carbonate, however recognized a remarkable defect that such a transparent rubber product was less stable than with basic magnesium carbonate and suggested surface treatment as a method for improving this defect.
Now the surface treatment with soap has been carring on and get the following results.
(1) The weight of Mg(OH)₂ increased in the flow of wet CO₂ gas, but showed little change in the flow of dry CO₂ gas and also in steam at room temperature.
(2) The weight of soap necessary for surface treatment was recogniyed about 0.05 gr per 1gr of basic magnesium carbonate either from settling test or from calcuration of surface area.
(3) In the case of Mg(OH)₂ for compounding material of transparent rubber, this weight would be 0.085gr by each method.

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I have studied a method of the rapid determination of Calcium using an organic analytical reagent.
This report, a preliminary experiment, is the result of my research on the Post-Precipitation of Magnecium on various ratios. Expecially, standing tempereture and time have a great influence on this Phenamenon and their increase has increase the amount of the CO-precipitation.
Sizes of precipitation particles not dependent upon time and tempereture, but are dependent upon the concentration of the Magnecium ion.

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The author has studied the deposition of salts from Saturated Brine by evaporation at Boiling Point.
The experimental results are reprerented by the following table.(See order of separation of salts from Saturated Brine.)

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When evaporation takes place isothermally in the saturated aqueous solution of sodium chloride which contains other salt in addition to sodium chloride solution, the influences of salts upon linear and three dimentional growth velocity of sodium chloride seed are different.
Some of them disturb crystal growth of sodium chloride, other accelerate it. we studied on this problem at 1% addition of various sodium salt and we obtain the result the former are F^- CO₃=1-NO₂-SO₃=HPO₄=HCO₃^- the latter are Br^-C₂O₄=PO₄ SO₄=H₂PO₄^-. The order of these series exhibit the degree of their influences.
Furthermore, we studied the influences of HCl and NaOH at the various mol ratio between sodium chloride and excers Cl^- or Na⁺ ion by addition of NaOH and HCl.
Our experimental results showed that sodium chloride seed grows most rapidly at excess 10^-3 mol of them.

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We studied the distilling method using toluen or xylene for the determination of the moisture in common salt, and obtained the following resuts.
1) The state of dehydration of the hydrated salts such as CaSO₄. 2H₂O, MgSO₄. 7H₂O, MgCl₂. 6H₂O and Na₂ SO₄. 10H₂O-the minor constituents of common salt-agree generally with the results of thermogravimetric methods.
2) Xylene is rather suitable for the detemination of the moisture in common salt than toluene.
3) The salt is no need of crushing in the distilling method.
4) The result oftained by the distilling method is considered nearer to the true moisture than that of the thermogravimetric methods.
5) The moisture of salt is determined by distilling 50g of sample with 70-100g of xylene for about 60 minutes.

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