VOLCANOES OF THE PHILIPPINES. 



247 



quantities of ashes cover the surrounding districts far and wide. In 1814 the 

 town of Daraga was buried and the ejected matter was wafted as far as Manilla, 

 two hundred miles distant. 



Nazaraga (4,445 feet), a craterless dolorite cone, and Malinao, which appears to 

 have been quiescent for ages, continue the igneous chain northwards to Iraga, the 

 scene of a disturbance in 1641, when the little Lake Buhi was formed by a sudden 



Fig. 107. — SOTTTHEEN PaET OF LUZON. 

 Scale 1 : 1,500,000. 



I23°20- 



Lasb or breenwich 



I24°20' 



Dejiths. 



to 50 

 Fathoms. 



50 to 100 



Fathoms, 



100 Fathoms 

 and upwards. 



36 Miles. 



landslip. East of this lake the Tibi valley presents the most remarkable group of 

 thermal, sulphurous, and silicious springs in the whole archipelago. They are 

 copious enough to develop a rivulet of hot water, which the people of the neigh- 

 bourhood utilise for culinary purposes. The springs precipitate considerable 

 quantities of silica, covering the surface with dazzling white incrustations, and one 

 jet of water and vapour has a temperature of no less than 226° F. 



At the neck of the Caramuan peninsula stands the broad-based Ysarog (Isarog), 



