84 K. HONDA, T. ÏEllADA, Y. YOSHIDA, AND D. ISITANI. 



falling near the period of the binodal oscillation between Sau- 

 salito and West Berkeley sides. 



In Japan, at 11" 30'" a.m. on the 11th (in our time), the sea 

 at Hakodate was observed to rapidly retire, and then to rise in 

 level to about 2 m.; tlie rising and falling of the level lasted the 

 whole afternoon with a period of about 20"'. Betw^een 2" 30™ 

 and 2'' 35'" p.m., the oscillation was renewed with the largest 

 amplitude of 2.4 m. Admitting errors of observation of a few 

 minutes, the oscillation possibly corresponds to the oscillations 

 proper to the bay. 



The tide in the bay of Kamaishi began to oscillate between 

 9'' and 10'' a.m. of the same day, and the amplitude of oscil- 

 lation gradually diminished. At 0'' and 2" p.m., tlie phenomenon 

 was renewed ; and until TV or 6" p.m., the bay was observed to 

 oscillate with an amplitude of 3 m. and with period of 5"\ At 

 midnight, the sea was completely calm. Comparing the waves 

 with those in the Bay of Hakodate, we notice that the first 

 wave was not observed in the latter bay. 



At noon of the same day, large waves invaded the open 

 coast of Kazusa, but the sea soon became calm. At 4'' p.m., 

 still larger waves devastated the same coast, causing the loss 

 of many lives. These two waves possibly correspond to the 

 waves which visited the bays of Hakodate and Kamaishi a 

 little earlier. 



The calculation of the velocity of propagation of these 

 waves gave the following results : — • 



