Feb. 1911.] NAKANO.—THE VEGETAT. OF LAKES AND SWA3IPS. 



37 



the formet two, and originates at the village Awano. Another 

 one is the smallest, and is on the sonthern side of the swamp. 

 The rest on the southwestern side is the largest of the five 

 and is called by the name of " Kanayamaotoshi," which name 

 signifies that it starts near the village Kauayama. 



These five brooks have usually very spare water, but dur- 

 ing the rainy season, they bring to the swamp a large amount 

 of vt^ater. Then the swamp swells rapidly, and often flows 

 over the banks into the surrounding fields. 



Besides these brooks, the underground water also feeds the 

 swamp, because the sw^amp basin and surrounding valley are 

 about 10-12m below the top of surrounding hills, and the level 

 of the underground water lies about 10m down from the surface 

 of the hills, so that the level of the underground-water situates 

 a little higher than the level of the valley. For this reason, 

 in the valley of the swamp, a boring can make a flowing well. 



Fig. 2. 



Landscape of 1 esa-Swamp, showing its surrounding hills and rice fields. 

 {zme oi Sagiitulia sagiitifdla). 



