ハイドレート結晶成長を解明する試験の一部として, 生成熱の除去が金属伝熱面を通して行なわれる間接接触法試験を行ない, 次のごとき知見をえた.
1) プロパン以外のハイドレートは容易に大きく成長しその成長速度はハイドレート剤の種類により著しく異なる. しかもその序列はR-21>R-22>R-12>プロパンの順となり, ハイドレート剤の水に対する溶解度の序列と一致する.なお温度の影響は顕著でない.
2) すでに報告したハイドレート生成条件および本実験の結晶成長速度から, 最も有利なハイドレート剤としてR-21を選んだ.
3) 成長速度はハイドレート剤の液相濃度の一次式で表わされる.なお速度定数は撹拌強度に著しく影響される,
4) 結晶核発生の準安定域はハイドレート生成平衡線より大よそ100mmHgとなる.

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For the determination of SO₄^2- contained in oceanic salts, the author investigated a rapid analytical method of chelatometric titration, gravimetric method and others to make some improvements and obtained the following results:
1. In general, the chelatometric titration of Ba²⁺ in the presence of barium sulfate tends to bring about a negative error. Therefore, the author investigated to avoid this error by addition of ethyl or methyl alcohol and equivalent quantity to Ba²⁺. As the result, a visible change in color at the end point was observed by addition of alcohol to the sample solution, and the change of EBT-indicator was clearly observed in the presence of Mg²⁺ of more than 0.7 equivalent quantity to Ba²⁺. It was found undesirable to apply this method as it was to the magnesiumio n containinmg ore than 20 equivalenqtu antityt o SO₄^2- such as the brine produced by ion-exchange membrane method.
2. The author used Ba-EDTA to investigate a simple method of determining sodium sulfate and magnesium chloride contained in common salt.
3. The direct precipitation analysis method of SO₄^2- was improved by using the rhodizonic acid paper test.
4. Taking advantage of the fine grain precipitation obtained by the reaction of Ba-EDTA, the uthor determined the micro SO₄^2- by turbidimetric analysis. This method gave satisfactorya results to the determination of micro SO₄^2-.

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