In the table mean values of transparencies at the stations of observa- 

 tion as well as the average value for feach class of Forell's scale in the 

 waters near Japan, which are calculated by Dr. M. Uda, are reproduced. 

 The former is rather large for yellowish colour of sea. This is probably 

 due to the fact that in some stations the turbid riverine water covered 

 over sea-water and it makes the colour of sea yellowish. The trans- 

 parency, however, remains almost unchanged owing to the film of riverine 

 water being very thin. This phenomena is frequently observed in a bay 

 into where a great river empties. 



The products of the transparencies and the vertical extinction coeffi- 

 cients are almost constant for every class of colour of sea. The value 

 of product is, however, about a half that obtained by Professors H. H. 

 Poole and W. R. G. Atkins for the waters of English Channel. This is 

 natural, because in the case of our experiments the minimum values of 

 vertical extinction coefficients are used to calculate the product. 



Literature 



(1) Poole, H. H., and Atkins, W. R. G. : Photo-electric Measurement of Sub- 



marine Illumination Through the Year. Journ. Mar. Biol. Assoc, XVI, 

 p. 297, 1029. 



(2) Uda, M. : The Colour of Sea and Transparency in Waters Near Japan. Umi 



to Sora (in Japanese), X (8), p. 173, 1930. 



(3) Sawyer, W. : The Spectral Absorption of Light by Pure Water and Baj^ of 



Fundy Water. Co-ntr. Canad. Biol. Fish., N.S. (8), 1941. 



(4) Poole, H. H. and Atkins, W. R. G. : The Use of a Selenium Rectifier Photo- 



cell for Submarine Photometry. Jotirn. Mar. Biol. Assoc, XIX, p. 727, 

 1932. 



(5) Utterback, C. L. and Jorgensen, W. : Absorption of Daylight in the North 



Pacific Ocean. Journ. du Conseil, I>v, P- 157, 1934. 



(6) Suzuki, H. : Photo-electric Cell and Photo-voltaic Cell. (In Japanese.) 



Tokyo, 1938, p. 342. 



RECENT ADVANCES IN CHEMICAL OCEANOGRAPHY IN 



JAPAN 



By M. IsHiBASHi, Science Faculty, Kyoto University 



List of Titles in the Symposium, with References 



1. On Lead Content in Sea-water and its Geochemical Meaning : The 



Age of the Ocean (1), by M. Ishibashi, M. Tanaka, and H. 

 Hayakawa. 1943, Journ. Oceanogr. Soc. Japan, 2, 10. 



2. On the Regularitj' of Quantities of Elements Dissolved in Sea-water : 



The Age of the Oceln (2), by M. Ishibashi and Y. Harada. 1943, 

 Journ. Oceanogr. Soc. Japan, 2, 84. 



3. On Lithium Content in Sea Water and Bittern, by M. Ishibashi and 



K. Kurata. 1936, Journ. Chem. Soc. Japan, 60, 1109. 



4. On Rubidium Content in Sea Water and Bittern, by M. Ishibashi 



and Y. Harada. 1942, Journ. Chem. Soc. Japan, 63, 211. 



5. On Caesium Content in Sea Water and Bittern, by M. Ishibashi and 



Y. Harada. 1943, Journ. Chem. Soc. Japan, 64, 1049 and 1944, 

 Journ. Oceanogr. Soc. Japan, 3, 185. 



6. On Thorium Content in Sea Water, by M. Ishibashi and S. Higashi. 



1948, Reported at 69th Annual Meeting of Chemical Society of 

 Japan. 



7. On Vanadium in Sea Animals, by K. Kimura and R. Fukai. 1948, 



Journ. Chem. Soc. Japan, 69, 75. 



303 



