Succeeding to the 1st report, the results of drift-bottles experiments at the West entrance of Tugaru Strait, Hokkaido, Japan, which were carried out twelve times during April 1957 to March 1958, are summarized in this report. The main features are follows:-
(1) On the recovering ofdrift-bottles, “SUMMER TYPE” and “WINTER TYPE” were observed like in the 1st report.
(2) Three hundred and five drift-bottles were recovered (452 drift-bottles in the last experiments) and 53% of them were drifted to the coasts of the Japan and Okhotsk Sea (33 % in the last experiments), 34 % to the coast of Tugaru Strait (39 %) and 13 % to the coast of Pacific (28 %).
(3) Seven drift-bottles were drifted during April to August to the coast of Okhotsk Sea where none drifted in the last experiments.
(4) The most of drift-bottles which dropped near the coast at the station No.1, 2, 9 and 10 were recovered along the coast of Tugaru Strait and Pacific. But the most of drift-bottles which dropped off the coast at the station No.3 to 8 were recovered on the coast of Japan Sea.

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Sometimes white streaks or patches are seen on the sea surface. They look like white and in some cases glassy because of their damping effect of wavelets and are called “Slicks”. Appearance, transformation, movement etc. of, slicks were observed in Beppu Bay. They have some relations with the wind-velocity and wind-direction. It seems that slicks tend to be parallel with wind-direction and to diminish with the increase of wind-speed. Slicks are concerned with the distribution of organic substances in the sea water which are found coming originally from rivers and drains by the aid of Cons. O₂-Cl diagram. These organic substances damp out the ripple owing to their lowering effect of surface tension.

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The author has studied two of the chemical ingredients of inlet water, calcium and magnesium, and tried to see the variation they show according to the difference in characteristics of various inlets.
1. The chemical composition of inlet water is subject to variation according to the features of different inlets, and the variation is regular in each inlet.
2. In the water of such inlets as are noticeably diluted by land water, a great variation is caused by the difference in hydrographic conditions.
3. In stable and stagnant inlets, Mg/Cl is more remarkable than Ca/Cl as the indicator element of a water mass.
4. The chemical composition of sea water in inlets varies according to the chemical elements and the state of mixing of different water masses.

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In order to identify the factors which govern the dissolved chemical constituents of sea water, the author has measured the ignition loss of bottom mud and the consumption of dissolved oxygen, His findings are as follows:-
1. Relative analysis of ignition loss and consumption of dissolved oxygen shows that the two have a rational relation.
2. It is inferred therefore that the consumption of dissolved oxygen is effected mainly by inorganic colloids and organic humus colloids which are carried in by land water.
3. The degree of consumption of dissolved oxygen is larger in the middle of the inlet than at the mouth of the river, for which the various properties of the sediment of floating matter seem to be responsibles.

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