XI, A, 5 Pratt: Philippine Lakes 229 



Table II. — Analysis of water from crater of Taal Volcano. 



Parts per million. 



Silica (SiO.) 710.8 



Iron (Fe) 172.0 



Aluminium (Al) 26.1 



Manganese (Mn) 79.9 



Calcium (Ca) 556.8 



Magnesium (Mg) 909.3 



Potassium (K) 237.4 



Sodium (Na) 2,584.3 



Lithium (Li) none. 



Sulphuric ions (SO.) 2,732.0 



Phosphoric ions (PO4) none. 



Metaboric ions (BO2) small. 



Arsenic ions (AsO.) small. 



Chlorine (CI) 6,024.3 



Bromine (Br) . trace. 



Iodine (I) none. 



LAKE BATO 



Lake Bato, in southeastern Luzon, is a permanent body of 

 water, roughly circular in outline, which is situated in the wide 

 valley of Bicol River between Camarines and Albay Provinces. 

 It is very shallow, and its surface stands only a few meters 

 above sea level. Its area varies with the season and averages 

 about 25 square kilometers. A great part of the surface is 

 covered by vegetation, and the margins of the lake are low and 

 marshy. Fish are abundant, and the lake is especially noted 

 for the numbers of waterfowl which live in the vegetation- 

 covered portions. It appears that Lake Bato was formed through 

 slight elevation connected with Isarog Volcano, across the base 

 of one slope of which the outlet of the lake, Bicol River, flows.^^ 



LAKE BUHI 



Lake Buhi, in the southern part of Camarines Province, is 

 of peculiar interest because of the accounts of its origin, for 

 this lake is alleged to have formed within historic times. It 

 lies in mountainous country southeast of Mount Iriga, one of 

 the several volcanic peaks which dominate the physiography of 

 southeastern Luzon. The lake covers an area of 13 square 

 kilometers and is irregular in outline. No soundings are re- 

 corded for Lake Buhi, but it is probably deep for its size; 

 the surface is 75 meters above sea level. 



^ Adams, Geo. I., and Pratt, Wallace E., This Journal, Sec. A (1911), 

 6, 457. 



