46 



The Philippine Journal of Science 



The following tables show the base data, in parts per million, 

 and the results of computations from which the properties of 

 the waters are derived: 



Table 1. — Results of analyses and computations (station 1). 



GENERAL CHARACTER OF THE WATERS 



The waters from Angat and Montalban Rivers are charac- 

 terized by primary salinity and primary alkalinity, which prop- 

 erties are generally associated with the older rock formations, 

 the alkalies of which are their principal soluble decomposition 

 products. Excess of alkalinity also indicates that the carbonates 

 of the alkalies are present in the waters in sufficient quantities 

 to overcome all permanent hardness. 



The proportion of silica in these waters is also high In 



this connection, Palmer 3 expresses himself in the following way : 



"Bull. U. S. Geol. Survey 479 (1911) 22. 



