of mud particles. In the same year Nomitsu and G. Okamoto examined 

 the condition under which the oscillation of water can occur on a shelf, 

 and Nomitsu and K. Seno made a series of experiments on the formation 

 of black cosmic dusts found in deep-sea deposits, and showed that such 

 spherules can be formed by dropping fused metal balls into the water. 

 This year Nomitsu and T. Matsuzaki published an investigation of the 

 abnormally high sea-level accompanying the Muroto Typhoon in 

 September, 1934. G. Okamoto made a theoretical research, on the 

 river tides. A very interesting work of Nomitsu in this year is, however, 

 that of the effect of* mid-ocean pressure disturbance on the coastal 

 hydrographical conditions. He and T. Hattori explained the abnormal 

 fluctuations of water temperature and salinity in the Osaki Bay as the 

 effects of disturbances propagated from the centre of cyclones or typhoons 

 far to the south, thus enabling us to forecast the approach of the storm 

 in some measure. Nomitsu also studied the relation between the hydro- 

 graphic conditions and the run-off of the submarine hot springs in the 

 Beppu Bay. 



In the next year, 1940, no appreciable activity is seen from Kyoto. 



In 1941 Nomitsu and S. Otsuka examined the heavy water in the 

 sea and showed that this can be used as an identifying property between 

 different water masses. Momitsu also published a paper dealing with the 

 polytropic atmosphere and ocean, the coefficient of eddy viscosity 

 differing in different directions. By this supposition he could show that 

 the angle between the steady wind and steady drift currents induced by 

 the former is less than 45°, a result which V. W. Ekman got for an iso- 

 tropic ocean. He also studied along with Yasukazu Saito the phenomena 

 of freezing of sea water theoretically. 



In 1942 G. Okamoto discussed the drift currents in a polytropic 

 ocean considered by Nomitsu in the preceding year. Nomitsu, Yasukasu 

 Saito, and H. Tamura made experiments on the possible formation of 

 sand-banks on the bottom, as the effect of stationary water movement 

 such as secondary undulations of oceanic tides. They also gave some 

 suggestions on the formation of sand ripples. 



A very wide gap lies from 1942 to 1945 in which we see scarcely 

 any activity in Kyoto. 



In 1945, K. Seno published a consideration on the water movement 

 on the bottom of the Pacific, and through the Bosphorus and Dardanelles 

 Straits. 



Very unfortunately Professor T. Nomitsu, who has been very active 

 and guided the researches of younger scientists in his university, died 

 in 1946 on account of an accident. He was sixty-two years of age. 

 We hereby express our deep mourning for his death and pay respect 

 to his great achievement in every branch of geophysics. S. Hayami, 

 a former research member in the Shanghai Institute for the Natural 

 Researches, succeeded to his position. Recently Hayami, with 

 T. Takegami, made some theoretical studies on the turbulence and 

 convection in the uppermost layers of the ocean. 



M. Ishibashi, Professor of Kyoto University, has much interest in 

 chemistry of sea-water and has many contributions in this domain of 

 oceanography. 



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