20 s. Xakainnra and K. Honda : 



curve recorded by the limnimeter at Imazu, Avliere the stonn was 

 not observed, shows that there we had from 14 li. the usual 

 indentations on the curve telhng us of the presence of a disturbance 

 of the water somewdiere, and a seiche of a 30-minute period was 

 excited at 20 h.; but on tlie whole the motion of the water at 

 Imazu was very irregular Ijut not significant during the time. 



On the 17 th. August, another storm passed over the lake. 

 From the I'eports of the department offices concerning this storm 

 we see that it was restricted to the north part of the lake. Of our 

 limnimeters, only that at Imazu was in action at that time. We 

 heard the rolling of distant thunder at 6 h. 20 m., and at 8 h. 23 

 m. it began to rain. AVe had very heavy thunder at 8 h. 36 m., 

 and at 8 h. 42 m. ; it ceased to rain at about 9 h.. The sky 

 continued overcast during the rest of the day, and w^e had no wind 

 during the whole time. Owing to this thunderstorm, a beautiful 

 oscillation was produced with a period of 30 minutes, Avhich as we 

 have stated before, belongs to the seiche predominant in this lake. 

 The motion continued till noon of the next day making about 40 

 oscillations in all. The first part of the limnograph obtained at 

 Imazu is reproduced in PI. III. Fig. 1. The record wes unhappily 

 broken between 8 h. 10 m. and 10 h. 40 m. owing to accident to 

 the instrument. 



On the afternoon of the next day, i. e. Aug. 18 th., another 

 storm visited the w^estern shore of the northern basin of the lake. 

 The limnimeters were set up on that day at Imazu and Chömeiji,. 

 the latter place lying out of the path of the storm At Imazu, we 

 heard distant thunder first at 14 h., a SW wind began to blow^ at 

 14 h. 50 m., and it began to rain at 14 h. 55 m.. After many 

 lightning flashes and low thundering, w^e had two heavy peals of 

 thunder at 15 h. G m. and 15 h. 9 m., and then the storm subsided 



