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ing the east coast of Siberia and Korea. 

 Of this current only a small portion 

 touches the west coast of Yesso as an 

 undercurrent. Thus the Japan Sea, 

 with the tropical current on the Jap- 

 anese side and the Arctic on the 

 Siberian, shows remarkable climatic dif- 

 ferences on the same degree of latitude. 

 Otaru, where frosts are unknown, lies 

 on the same parallel with Vladivostock, 

 with its semi-arctic winter climate. 



Hakodate, situated at the Sangar 

 strait (this name is probably a cor- 

 ruption of Isugarn strait), between the 

 mainland and Yesso, has an especially 

 interesting marine flora. A branch of 

 the eastern cold current escapes to the 

 Japan Sea, washing the Yesso side of 

 the strait, and the west warm current 

 enters the same strait along the 

 Honshu shore. It is here that I have 

 made particular study of the algse. 



