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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ゴム配合剤を目的とする水酸化マグネシウムの品質を改良する為脂肪酸で表面処理を行つた場合製品の炭酸ガス気流中における重量変化とベンゾール中の沈降速度、沈降比容の測定により表面処理の效果を判定する方法を検討した結果 (1) 水酸化マグネシウムは炭酸ガスを含まない水蒸気中又は乾燥した炭酸ガス気流中では殆んど重量変化は認められないが、水蒸気で飽和した炭酸ガス気流中では極めて顕著な重量増加を示す。(2) 塩基性炭酸マグネシウムに就て、沈降試験の結果求めた表面処理に必要な石鹸量は試料1gr当り約0.05grであり、表面積より計算した必要量とよく一致した。(3) 硫酸マグネシウムとアムモニア水とで生成せしめた水酸化マグネシウムに就き、両方法を用いて表面処理に必要な石鹸量を検討した結果はよく一致し1gr当り約0.085grであつた。

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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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