12 K. HONDA. Ï. lEllADA, Y. YOSHIDA, AND D. ISITANI. 



Ill the excursion of the summer vacation of 1904, Mr. S. 

 Iwamoto, a graduate of physics, was our cooperator ; stations 

 were the bays of Ryôishi and Kamaishi in Kikuchiu, the bays 

 of Kojirohama, Yoshihama, Okirai, Eyùri and Ofunato in Eikuzen, 

 coasts of Niigata, Kashiwazaki, Naoetsu, Fushiki and Tsuruga 

 on the Japan Sea coasts. Besides, Shizuura in Suruga, Kame- 

 zaki and Kamagôri in Mikawa were chosen as our stations. 

 Susaki in Tosa was again observed in this summer. 



In the winter vacation of the year, the excursion was un- 

 dertaken on the coast of Kiushiu. Observed bays were Hoso- 

 shima and Aburatsu in Hiuga, Kagoshima, Nagasaki and Shi- 

 monoseki. The bay of Hiroshima in the inland sea of Seto 

 was also observed. 



In the spring of 1905, observations were made at Atami 

 on the western side of the Bay of Sagami. The summer vaca- 

 tion of the year was spent in the excursion to Hokkaido ; the 

 observed bays were Otaru, Nemuro, Hanasaki, Hamanaka, 

 Mororan and Hakodate. At Hakodate, Mr. Watanabe again 

 assisted our observations. In the winter vacation, the bay of 

 Shimoda in Izu was observed. 



In the spring vacation of 1906, the bay of Moroiso in 

 Misaki was observed. The summer vacation of the year was 

 spent in the observation of the Strait of Naruto, which is 

 famous for its rapid current ; Mr. T. Fukuda was our co- 

 operator. Since July, 1906 the tides of the Bay of Tokyo have 

 been recorded by a tide-gauge of our system, set up by the 

 Office of the city. 



Ill discussing our results, the valuable observations by As- 

 sistant Professor A. Imamura at Miyako and Odsuchi in Eikuchiu, 

 and Hiragata in Hitachi were utihzed. These observations wore 



