46 K. nONDA, T. TEEADA, Y. YOSHIDA AND D. ISITANI. 



second stations, as well as the second and third stations were 

 simultaneously observed. 



At Kajiki, the tidal curve was extremely smooth, showing 

 no trace of secondary undulation. It appears then that Sakura- 

 . jima nearly screens long waves from Ijeing propagated into the 

 bay. The tidal curves at Kajiki and Kagoshima almost coin- 

 cided with each other, showing tliat the narrow channels have 

 neither dauiping nor retarding effect for the oceanic tide of ex- 

 tremely long wave length. 



The record of Kagoshima was generally very simple, but 

 frequently regular undulations of 17.2" and 22.8'"- 23.9" are 

 observed. 



At Ibusuki, the observed periods are 14.2" and 18.3"- 

 20.6". Since tlie undulations at Kagoshima were very faint 

 during our observation, the existence of the corresponding waves 

 at the station is not certain. 



In the calculation of the peiiod of the oscillation in the 

 bay that part which extends from the mouth to Sakurajima, 

 is only to be taken into consideration, because the rest is not 

 disturbed by ordinary waves. The calculated period of the 

 fundamental oscillation is 107", whicli exceeds very much the 

 observed value. The observed undulation may possibly be 

 due to progressive waves, which have the same periods as 

 those frequently found in different coasts of Kiushiu. That 

 the amphtude of the undulations is considerably less in Ka- 

 goshima than in Ibusuki, indicates the plausibility of the above 

 view. 



(4) Nagasaki (Jan. 9-13, 1905). Top. 60. PL XLIV-XLV. 



Nagasaki is a well known liarbour on the western coast 

 of Kiushiu. The observation was made near the end of the 



