Na₂CO, NaHCO₃and their mixture, which were added to the carnallite solution, converted MgCl₂into MgCO₃·3H₂O, and from this solution the Engel salt was deposited by carbonatation. The most suitable amount of the salts for the precipitation of the Engel salt was investigated. To get the product of good quality, the suitable amounts Na₂CO₃and NaHCO₃were 1.5-1.2 times equivalents of the content of MgCl₂in the carnallite, but their yields were 70%-50%. When NaHCO₃was used, the carbonatation process was not needed for the precipitation of Engel salt, but the yields ware very bad (below 50%). The mixture of Na₂CO₃and NaHCO₃could get the best results in the purity of the product and the yield of potassium.

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海水中に溶存するマグネシウム, カルシウムを直接電解することによつて分離するのに, ほとんど完全にマグネシウムを分離するため, 隔膜を使用して水酸化マグネシウムとして析出させる過程について, 前報の結果から電流密度を一定にして, 30℃で因子として通電量のみを選び, 電解液中のナトリウム, カリウム, 硫酸イオン, 臭素の諸量の変化, 陽極液中における臭素酸イオンの生成などについて通電量の及ぼす影響について考察し, その量的関係を求めた。
臭素は全く塩素と同じ挙動をし, 両者の分解率も同程度であるが, 酸化された状態は異り, 塩素は大部分がガスとして出るのに反して, 臭素は臭素酸イオンとして陽極液中に存在する傾向があり, 電解条件, 電解液の特性を適当に保つことによつて, この反応を再現性よく行わせることができると考えられる。

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Fifty horse-mackerels Trachurus japonicus (TEMMINCK and SCHLEGEL) were separated into five groups according to the amount of the antioxidants, BHA or BHT, which were contained or not contained in the table salt, and then each group was salted by a dry salting method for 20 days at 15°. using 30% of the salt in weight to the total fish of one group. The results obtained were summerized as follows:
1) The table salt mixed with 1% of BHT showed some obstruction to the salt permeation, but the salt with 0.02% of BHT showed no such effect. It was noted that the results obtained were the same as those of the previous paper.
2) The table salt coated with 0.01% of BET or 0.02% of BHA·BHT (half and half) did not show obstruction effect. These results are different from those of the previous experiments.
3) In view of the above results the author considered that a very small quantity of the antioxidants would not obstruct the salt permeation into fish meat for practical use.
4) The table salt containing BHA turned into brown colour during the experiment and the gloss of the fish vanished. These phenomena lowered the commercial value of the salted fish.

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When sea water or brine are treated with slaked lime, Mg²⁺is separated as hydroxide. And small quantity of SO₄^2-is deposited as calcium salts during the early stages of the concentration and thus removed from the solution before it becomes saturated with any other salts. The solution may be considered to form the quaternary system CaCl₂-KCI-NaCl-H₂O. So, the author investigated the following 2 relations.
(1) The isotherms for the quaternary system CaCl₂-KCl-NaCl-H₂O were determined at 25°. 0° and -10°C.
(2) The solution was evaporated at the boiling point to various degrees of concentration, cooled down to 25° or 0°C, and alkali chlorides were deposited out. The amounts of alkali chlorides obtained were compared with the values calculated by using the equilibrium diagram. As the result, it was found that these two results coincided fairly well.

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Calcium hydro ychloride is known as the double salts which have been a chemical composition of x Ca(OH) ₂·y CaCl₂·zH₂O. At first, we investigated on the equilibrium of the system Ca(OH)₂-CaCl₂-H₂O, because there are various types of double salts reported of which the conditions for preparation are not known exactly. And then, the equilibrium of the system Ca(OH) ₂-CaCl₂-KCl-NaCl-H₂O were similarly studied, in order to know the condition to get these double salts from sea water, brine or bittern of which Mg²⁺had already been replaced with Ca²⁺completely by the treatment with slaked Iime.
As the results of measuring these two kinds of equilibrium, we confirmed that two kinds of double salt existed in these systems and their chemical compositions were shown with 3, 1, 13 and 1, 1, 1 as regard to x, y, z respectively in the above mentioned formula, and then, the conditions for their preparation computed.
We discussed the removal of calcium chloride from de-magnesiumed sea water, brine or bittern by separating such double salts, and concluded that it is impossible to get the double salts from such a dilute solutions of calcium chloride as de-magnesiumed sea water or brine, and only possible when mother liquor or bittern contains 8% or more calcium chloride.

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