巻号一覧
9 巻, 2 号
選択された号の論文の9件中1～9を表示しています
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安田 秀明1940 年 9 巻 2 号 p. 47-48
発行日: 1940/07/25
公開日: 2008/02/29
ジャーナル フリーOn the concave surface of the centrum of vertebral bone of Theragra chalcogramma (PALLAS), there are year rings consisting of the transparent and opaque rings arranged alternately. On the side against neural spine the marginal part of the opaque ring is often partly transparent, and can be considered as the spawing mark (Fig. 1). With fishes from Hokkaidô and from Niigata Pref., the number of rings having such mark were reckoned as shown in Table 1.抄録全体を表示PDF形式でダウンロード (703K) -
齋藤 乕治郎1940 年 9 巻 2 号 p. 49-50
発行日: 1940/07/25
公開日: 2008/02/29
ジャーナル フリーMIYOSI1) has detected that winter rings of the scales of Kamchatka silver salmon can be classified into two kinds, of broad and of narrow zones. The same can be classified dichoto-mously in another way, according to the density, or the number per unit length, of the circuli in each winter zone. Statistical examination as to the rate of coincidence of the broad winter zone to the case of denser circuli, showed local variation to a certain extent.抄録全体を表示PDF形式でダウンロード (93K) -
III. 座頭松浦 義雄1940 年 9 巻 2 号 p. 51-60
発行日: 1940/07/25
公開日: 2008/02/29
ジャーナル フリーThe present account deals with the results of direct observations on the humpback whales brought into the floating factory “Kyokuyô-maru” during the Antarctic season 1938/39. Dur-ing the period extending from 18th November 1938 to 8th February 1939, a total of 248 whales was examined and more than 70% of them were caught in the area between 61°-63°S. and 100°-105°E.
(1) Of 248 humpbacks examined 174 were females and 74 were males ; thus the sex-ratio of the whales showed great segregation of females in the above-mentioned area.
(2) The colour pattern of the humpbacks was divided by LILLIE'S method according to the gradation occurred in the amount of black and white as shown in Fig. 2. The colour type of the whales was rather alike to that of New Zealand group than that of South Africa and South Georgia groups. The differences in colour were not accompanied by any other distinguishable characters.
(3) Examination of the genitalia showed That female humpbacks become sexually mature at a length of about 12•1m. This length is somewhat shorter than that (12•5m) suggested by MATTHEWS (1937). The smallest mature female recorded was 10•9m. long while the largest immature one was measured 12•4m.
(4) The average number of corpora lutea of 89 females (the average length of which was measured 12•78m.) was 4•78. It was seen from this that female humpbacks were consisted of average same age during the 1924-1931 season at South Georgia and South Africa and during the 1938/39 season in the mentioned area.
(5) Of 16 adult females with only one corpus luteum 10 were pregnant, I was lactating and 1 was recently ovulated or pregnant. Thus at least 11 (69%) whales would be estimated as they were pregnant in the first breeding season and nearly the same results were obtained also in the whales with two or three corpora lutea.
It might be tentatively concluded same as blue whales that number of unfertilized ovula-tions or formations of corpora atretica before pregnancy, if any, must be very few. Neither multiple ovulations nor multiple pregnancies were observed throughout the season.
(6) The apparent constitution of the, stock i.e. the ratios of the different classes of whales examined might be summarized as follows. (See page 52).
High proportion of pregnant whales among mature whales were obvious against low pro-portion of resting and recently ovulated or pregnant whales when compared with blue and fin whales.
(7) Assuming the females caught belong to an independent stock, the stock of whales in the area were tentatively calculated (WHEELER'S method on fin whales was adopted) not wi th standing insufficient data and heterogeneous composition of the catch.
Analysis of the age groups of mature females determined by the corpora lutea during the season showed a rate of reduction of 32% on an average and besides it was proved by calcu-lation that as there produced only about 64% of immature females necessary to keep the stock at its present level, considerable damage is being done in the area concerned.抄録全体を表示PDF形式でダウンロード (1407K) -
長谷川 漸成1940 年 9 巻 2 号 p. 61-63
発行日: 1940/07/25
公開日: 2008/02/29
ジャーナル フリーThe cubes of gelatin or agar-agar gel of the same size were immersed each in an excess of sodium chloride solutions of about 0, 10, 15, 20 per cent and kept either at room or low temperature. Each time before and after immersing, the weight and water content of each cube were observed, and salt content was measured at intervals, as shown in Figs. 1-7. The author thinks that the phenomena, similar to fish curing, that occurred in this immersing were very complicated, therefore, data are here only indicated.抄録全体を表示PDF形式でダウンロード (163K) -
岡田 光世1940 年 9 巻 2 号 p. 64-66
発行日: 1940/07/25
公開日: 2008/02/29
ジャーナル フリーFrom ITANI, ITÔ(4) and TAWA(5)'S observations on the time-temperature relations of cans during heating and cooling, coefficient of external heat transmission was determined on the following assumptions: -Theories of heat conduction in a finite right circular cylinder can be applied, and external heat transmission is infinitely great duringrl heating.抄録全体を表示PDF形式でダウンロード (149K) -
尼崎 保1940 年 9 巻 2 号 p. 67-70
発行日: 1940/07/25
公開日: 2008/02/29
ジャーナル フリーAn experimental refrigeration chamber, in which cold air is made to circulate with a fan, as shown in Fig. 1, was examined with respect to the distribution in temperature and humidity. Rate of dehumidification at the refrigerator as well as rate of increase in humidity of the air after leaving it, was proved to be proportional to the difference in tension between the present and the saturated vapour in every pact of the chamber.抄録全体を表示PDF形式でダウンロード (213K) -
小久保 清治, 川村 輝良1940 年 9 巻 2 号 p. 71-78
発行日: 1940/07/25
公開日: 2008/02/29
ジャーナル フリーThe titration curve of the pH of lake water has been drawn, using BCG and n/200 HCl solution. The titration curve and consequently the buffer value (Cotag α) varies not only with lakes but also with depth in, one and the same lake.
Examining the buffer value on each vertical layer it was found (1) that there is a general tendency that the buffer value of the hypolimnion increases with depth, the Cotag α ranging from 0•70 to 2•70, and (2) that the buffer value in the epilimnion is more or less irregular in vertical distribution, probably because of the effect of other factors such as CO2 tension and alkali reserve of water. The magnitude of buffer value seems to be due mainly to the BHCO3 and H2CO3 contents of water.
No data have previously been made concerning the buffer action of lake water, though numerous data have been available in regard to the pH and its vertical distribution. The method of titration curve enhances the interest of pH study in limnology.抄録全体を表示PDF形式でダウンロード (513K) -
木下 虎一郎, 石栗 俊良1940 年 9 巻 2 号 p. 79-80
発行日: 1940/07/25
公開日: 2008/02/29
ジャーナル フリーBetween water temperature and the crop of Undaria pinnatifida (HARV.) SUR in the province of Hukuyama, western Hokkaido, the correlation coefficients were found to be as high, as r=0•68 in August, the season for the zoospores to be discharged, and as r=0•69 in June, when the alga is liable to be washed away if temperature is too high. The results are in agreement with those found in northern Hokkaidô by KINOSITA and SIBATA, and also in Etizen by KAWANA, though in the latter district (Etizen), the crop season of this alga is a month earlier than in Hukuyama.抄録全体を表示PDF形式でダウンロード (119K) -
五十嵐 正治1940 年 9 巻 2 号 p. 81-83
発行日: 1940/07/25
公開日: 2008/02/29
ジャーナル フリーDEFANT-ERTEL'S theories(1) on the depression of surface salinity due to precipitations and its recovery after the rains were proved to be applicable to the cases of daily variations of coastal surface salinity in Kominato Bay, with allowance for rather slight deviations.
抄録全体を表示PDF形式でダウンロード (162K)
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