A semi-micro method and an appropriate apparatus suitable for the method (Fig. 1) have been described.
It has been observed that the distillation of hydrogen sulfide by using the present apparatus takes only five minutes (Table 2). The distillate shall be absorbed by zinc acetate instead of iodine solution because of the fact that a highly diluted iodine solution is liable to change its concentration due to evaporation especially when mixed with a warm distillate (Table 1). A comparison between the carbon dioxide-aeration method and the present one has been made on a sulfide solution with a fairly good agreement in average (Table 3 and 4).

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No volatile compounds except methyl sulfide have been reported so far Ulva pertusa K. The following results have been obtained by fractionating various acidic and neutral compounds contained in the steam-distillate of a large quantity of air dried Ulva.
1. After several preliminary trials, an appropriate method for the separation of volatile compounds in the steam-distillate has been devised and given in diagram 1.
2. The addition compound of methylsulfide with bromine showing the same melting point as Haas reported, has been obtained from fraction (2) which does not condense at thesteamdistillation. Atleast two carbonyl compounds have been isolated as their respective hydrazones from fraction (2).
3. The existence of several carbonyl compounds have also beenconfirmed in an ethereal portion (fraction 6) recovered from an ethereal extract of the steam-distillate.
4. From a soap fraction (13), obtained after saponifying the ethereal extract freed from free acid with dilute potassium hydroxide, have been isolated palmitic acid and an odorous unsaturated compound which loses its odour on the catalytic hydrogenation using palladium black.
5. Due to a small yield of free acids soluble in thesaturatedsolution of sodium bicarbonate (fraction 7), only an acid yielding p-bromphenacyl ester having m. p. 124-50°C. has been obtained so far.
6. The fraction of neutral compounds (14) gave on fractional distillation two fractions, one yielding 2, 4-dinitrophenyl hydrazone having m. p. 128°C. and the other, an a bromide showing a gradual decomposition between 174° and 190°C.

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The second method to economize the electric power by which fishes shall be electrified or electrocuted is to be found in the studies on the froms of electric waves. To get the clue of the finding, the author compared the effects of stimuli by the three electric currents, or alternative current (A. C.) and full-wave rectifying current (F. R. C.) and half-wave rectifying current (H. R. C.).
The results got are as follows:-
a) To equilize the strength of of stimuli with A. C, . from 2 to 4 times electric power is needed in F. R. C., from ¹/₃ to ²/₃ electric power is needed in H. R. C..
b) In the stimuli by R. C., the reaction is more acute. When the anode is set at the headside and the cathode at the tail-side, than the reverse case.
The difference between the sensibilities by those two settings is more remarkable in small fishes, but it becomes unperceived in large fishes.
c) In small f ishes electrifying voltage are low; on the contrary, in big fishes electrocuting voltage are low. These facts suggest us any methods to keep larvae of fishes from the annihilating effects.

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The fish muscle increases in weight while it keeps the freshness, by absorbing water when it is cooked in water. And if this heated muscle is soaked in saline water, the increase in weight becomes more intense. The changs seems to be greater when it is cooked in higher temperature. On the other hand, if the temperature reaches to a certain limit, the muscle decreases in weight, while in the former case it increases, owing to the heat coagulation of protein.
As a result of the composition of these opposite actions, a peak appears on the hydrating curve. the peak becomes low more rapidly in accordance with rising of the previous temperature and moves into the lower side of the temperature as the time of pickling extends.
The maximum point of the dehydrating curve lies at near 60° which corresponds with the coagulating point of myogen. And the curve corresponding the coagulating point of myosin doesn't appear. We consider, therefore, that there is only one kind of coagulable protein in fish muscle while it is fresh.

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The coagulation temperature of the myosin, isolated and purified from the fresh muscle of carp-fish, is usually determined by the method which measuring the lowest temperature that makes the myosin insoluble in most adequate solution as shown in Table 1. This method is not, however, always suitable because the troubles are not few.
To determining the coagulation temperature easily, the author applied the viscometrical determination by using, Ostwald's viscometer, and obtained the curve of relative viscosity plotted against the temperature as showin Figure 1. First winding point of the curve is indicating the beginning of flocculation of myosin by heat denaturation, and the second is showing the second is showing the finish og flocculation. This second winding point (45°C) is the coagulation temperature of myosin.
The ciscometrical determination was, however, unfited for the salt-free precipitated protein (Figure 2).

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The Toko Bay is one of the larger indentations along the Pacific coast of Honshu. The remains of molluscan shells collected from 21 stations in this bay (see fig. 1), consisted of 119 species, viz. 60 pelecypods, 56 pastropods and 3 scaphopods. The dominant species among them were the following 5 species, namely, Theora lubrica Gould, Raeta yokohamensis Pilsbry, Aluenius ojianus (Yokoyama), “Gingula” matusimana Nomura and Siphonodentalium n. sp.. While the unmber of species collected from single station was larger on sandy bottoms of Nakanose and Futtsu areas, the unmber of speciemens was larger on muddy bottoms of north-east area and decreased toward the south-wast area. The distribution of Theora lubrica and Raeta yokohamensis, which are indicator animals of strong embayment, was thicker in the north-east area than in the south-west. Aluenius ojianus was more unmerous in the south-east area. These thanatological results seem to indicate that the cline of ecological conditions in from the weak embayment character of the south-west to the stronger of the north-east. Among notable species there were Pyrunculus tokyoensis Habe, an endemic species to this bay and Lucinoma annulata (Reeve) which are may be a northern relic. Cylichnatys striata (Yamakawa) and Eufenella pupoides (A.Adams) which are common constituents of the benthos of bays on the southern Pacific coast of Honshu, were not found in this bay. The molluscan remains near the mouth of this bay had the affinity not to the funa of mouths of bays in southern Japan, but to that of continental shelf bordering Japan, its characteristic species being Sarepta Speciosa (A. Adams), Enida japonica (A. Adams) and Limopsis tajimae Sowerby.

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Impact velocity and energy necessary to fracture the netting cord was caluculated when the netting cord was striken by a single-blow.
The results are obtained as follows:
1) More energy for fracturing the wetted cord is necessary than the dried.
2) Energy necessary to break down the netting cord increases in accordance with increasing of impact velocity or weight of pendulum.

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