Seiches in Some Lakes of Japan. 41 



i^ 3. Hakoné Lake. 

 1. KesiiU of Observations. 



Tlie charming lake of Hakoue, a noted summer resort, is 

 situated at 139° O'E. and 35° lO'N., its surface being about 720 

 meters above sea level. Its length is more than 6 kilometers, and 

 it is widest at its southern end, where its breadth is about 2 

 kilometers. It gets very narrow and deep at a distance one third 

 of the whole length from the northern end, where it is about 600 

 meters broad. The lake is surrounded on almost all sides by pretty 

 steep mountain ridges, except at its northern end, where there is 

 a small meadow. The most prominent peaks are Komaga-take and 

 Kami-yama on the northeastern side, the former rising 630 meters 

 and the latter 720 meters above the level of the lake; while on its 

 southwestern side Mikuni-yama rises about 380 meters above the 

 lake. It is the commoly accepted opinion among our geologists, 

 that Hakoné lake is an atrio lake formed by the choking up of a 

 part of the atrio of the Hakoné volcano. Since the first formation 

 of the atrio, a condsiderable time must have elapsed before the last 

 eruption took place, that caused the formation of the lake. The 

 people say that, when the water is clear, one can still sometimes 

 see the tops of the upright stems of the conifers that have stood 

 immersed in the water from bygone ages. In several places near 

 the lake, stems of trees have been found buried in the ground. 



The observations at this lake extended over eight days, The 

 number of the stations were six in all, at one of which, i. c. at 

 Hakonc, the modified Sarasin limnimeter was set up, while an 

 " N "-limnimeter was carried from one station to another in order 

 to compare the phases at different places with that at Hakoné. 

 We also made soundings with a simple plumb line, at 139 points 



