In the recent, years the authors contributed to study the mechanism of flotation on the standpoint of organic chemistry. As to the experiments endeavoured, we used the pyrite produced at Sakakibara mine (FeS₂=98%) as a sample ore, which were crushed in 65-200 200 mesh, and applied to the 50 g. MS's flotation cell, in order to determine the collective. power. The procedure and conditions of the experiments are described in the original Japanese article in details.
The results we gained are as follows:
1. Fatty or terpene compound in which OH group is combined as alcohol shows the superior frothing power, but has' not the collective power at. all. The compound interferes with the collective property all the more when OH group is introduced in it.
2. In the case of the compound in which -OH group is combined with benzene nucleus as phenol, its frothing power is very strong, but it is rarely supposed to develop the collective power. Generally the frothing power of phenol is as great as that of alcohol, but it has not the collective property.
3. The frothing property of aldehyde or ketone is as same as that of alcohol, but its collective power is poor whenever the reagent is of fatty, terpene series or, aromatic compound.
4. The frothing property of fatty acid resembles the property of the corresponding alcohol, but its collective power is exceedingly great on the contrary with that of alcohol. Notwithstanding the frothing power diminishes gently when the compound is in higher order to a certain extent, the collective power increases in proportion to the increase of the number of the carbon.
5. Aromatic acid. shows the poorer collective power than fatty or terpene acid.
6. Oxime group (=NOH) has a strong frothing and collective power. When the oxime group is combined with another radical it makes correspondently a better frother or collector, or better collective-frothing agent.
7. The frothing power of fatty aldoxime shows the greatest value in carbon number of 5, 6 andt 7, but diminishes below 4 or over 8.
8. Although aldoxime of olefinic terpene series has both properties of frothing and collection, there is a few substance which has the both properties at the same time. In many cases the increase and the decrease of the power of frothing or collecting are in opposite direction; thus the oxime in which molecule the double bonds predominate has the very strong collective power and lose it when the double-bonds reduded, but the frothing power increases conversely when the double bonds are reduced.
9. It is analogous to the case of the variation of the collective power of the above mentioned oxirne that the frothing power of olefinic terpene alcohol increase with the increase-of the double bonds, but the order of the variation of the frothing power is quite reverse in each cases.
10. Oxime of aromatie aldehyde or ketone has the poor collective power. Introduction of phenol group into the molecule rather hindered the collective power, but its frothing power is very strong.
11. In the explanation of the special feature of chemical classification the aromatic series shows the distinct difference, from other series in the collective property of. acid and oxime.
The collective power of the substance of fatty, aromatic or terpene series decreases with the decrease of the double bonds.

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The natural heat generation of copper concentrates is due. to the accumulation of the heat of reaction caused by natural oxidation, which is caused by air and moisture.
The high degree of oxidation of copper concentrates is due to the fact of increased difference in electrode potentials of ch.lcopyrite and iron pyrite
Although it has often been said that mixing lime with copper concentrates is effective in preventing natural oxidation, my experiments have resulted in showing the lime accelerates instead of preventing.
I have found out after many experiments that soap solution is most effective for preventing the natural heat generation of copper concentrates which are liable to cause spontaneous combustion.

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墨洋丸沈没後直ちに北米合衆國の保險業者は各荷主に對して保險金を仕拂ひたる處なれども、一方當保險業者は引續き日本郵船會社を相手取り北米合衆國の法廷に損害賠償の訴訟を提出せり。即ち自然發火の危險性ある銅精鑛と共に棉花其の他の貨物を積載し、銅精鑛の自然發熟の爲本船を沈没に至らしめ、從つて他の貨物をも損失せしめたるは、船會社其の責を負ふべきなりとの理由に基くものなり。其の要求する賠償金額は邦貨にして約110萬圓にして、國家非常の時に際し外貨にてかゝる多額の金を仕拂ふことは實に大なる損失なるを深く憂ひ、郵船本社の外、關係者に於て有利に導かんと苦心努力したれども、當初に於ては殆ど勝算なく深く焦慮したる處なり。然るに時偶々、筆者等の銅精鑛の發熱性及び其の防止法の研究もやうやく進捗したるを以て、其の研究報告と本文に示す墨洋丸沈没原因に關する考察を、參考として、北米合衆國法廷に提出したる處、状態は急に我に有利に好轉し、遂に多額の外貨の流失なく、無事決着を見たるは誠に欣快の至りなり。即ち本文に示す如く、墨洋丸乗組員の當時取りたる應急處置(漲水)は麻袋等の有機物が燻り居たるを消火せんとして行ひたるものにて保險法規上何等の手落なく、然るに結果より見てそれが適當ならざりしに依り沈没にまで至りたるものにて、全く從來銅精鑛の發熟に對する研究もなく、其の知識も不明なりしに基因するものにて、其の責任を會社が負ふべき要なきを強調せしものなり。此處に當時の報文を其儘示し、參考に供さんとす。

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The conditions for the extracting manganese from the poor Rhodochrosite are with sulphur dioxide are described. Almost all of the Manganese can be extracted from the powdered are which is in sufficient contact with the solution of the sulphur dioxide. The impurities extracted from the ores in our treatment are iron and calcium. In our extractinrmethod the most part of the iron, is extracted previously, and then the calcium and the manganese are followed.

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