The oxygen absorption of lake muds in a number of lakes in Japan, such as L. Takasuka, L. Kitaura, L. Tyûzenzi, etc., were determined by the author. Five grs. of fresh lake mud, whose oxygen content was desired, were placed in watre, then into a bottle of 280cc capacity, and then shaken vigorously 200 times and left to stand in a dark chamber for 4 hours. The decrease of the oxygen in the water was measured by Winklers standard method, following which the quantity of oxygen absorped by the humid muds at different temperatures were reduced to the equivalent .value of a dry sample of 1gr. at l5°C.
The horizontal and vertical distributions of oxygen absorption in lakes were studied from the limnological point of view, with the following results:
1) The horizontal distribution of oxygen absorption of lake muds in takes is controlled by the lake stream.
2) In non-stagnent lakes (S. Yoshimura's order II), there is an apparent relation between oxygen absorption of lake muds and depth, but there is no such relation in stagnent lakes (order III).
3) No relation, between oxygen absorption and coarse debris was observed in any lake type, although a positive relation was found between the O₂-absorption of lake muds and fine debris which, though evident in eutrophic lakes, is obscure in oligotrophies.
4) A linear relation between the O₂-acs. of lake muds an Loss Ignition was observed, the gradient of the line varying gradually with the fertility of the lake.
From these fact the author concludes that the oxygen absorbing capacity of lake muds depend upon its carbon contents.
5) In oligotrophic lakes, the influence of reduced substances, such as hydrogen sulfide, ferric iron, methane. etc., on the absorbing capacity of lake muds, is important.
6) From his experiments it seems that there is no relation between microorganisms and decomposition of lake muds.

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The writer has discussed in his first report, local names of wind from northern direction, “Anazi, Tamakaze, Narai” and “Ai”; from southern direction, “ Mazi” or “Maze, Mimazi” and “Hikata” and from the east “Koti”. In second report, it was, studied especially on “Yamazi” and “Yamase.” The writer in this paper discusses the character of “Dasi” and “Orosi” with following conclusions
1) “Dasi” is widely known along Japan Sea coast, but not along the Pacific side except TRkai district.
2) “Dasi” is the noun conjugated from the verb “dasu” or “to put out.” It means the wind that blows down a mountains, mainly with the character of Föhn.
3) Teref ore this has no definite windrose, but has. been defined by its character.
4) Though very distinct discrepancies between “Dasi” and “Yamase”, there is some resemblance among them, i.e. each of them blows from mountainside. In some place we can point out their misuse or confusion of meaning. In Niigata Prefecture we cannot hear the name of “Yamase” at all but “Dasi” in spite of the formers practical distribution. From these facts, we could not have concluded that “Yamase” had been' replaced by “Dasi”.
5) From their distributions (Figs. 1. in this paper and the previous article) we can easily. understand that “Dasi” is younger than “Yamase” in their history.
6) “Dasi” told. in Tokai region, was brought by sailors in Tokugawa period from the Japan Sea coast. Therefore we can find this name remained along the navigation route in that time (Edo_??_Japan Sea_??_Tohoku). And in Tôhoku, this is spoken only in seaside, villages, but no longer in inland village.
7) On the Pacific side “Orosl” corresponded to “Dasi” on Japan Sea side is told. It is one of their most predominant characteristics that both of them are called associated with geographical names. For example, “Sendai-dasi” of which Sendai is the city name and “Huzi Orosi”.
8) “Orosi” is limited in inland area. Therefore we can easily understand that its originated from farmers society.
9) Simiarly “Dasi” has its origin among rural communities in Etigo region as its distribution stands out (see Fig. 1).
10) Though “Orosi” is known only in the limited area, “Dasi” has very wide distribution along the coast. This is why the former has been whispered from farmers to fishers and sailers, but the latter has been told only in rural villages. Therefore sailors are better carrier of words than peasants.

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