X, A, 4 Pratt: Location of Artesian Wells 239 



common sources of artesian water. In the Philippines they are 

 of limited distribution and consequently unimportant; as yet 

 no wells have been drilled into them. Water might be obtained 

 from buried marble, which is often cavernous, but schist and 

 gneiss would probably be found to be dry. 



Schists and gneisses, together with massive igneous rocks, 

 are the basal formations in the Philippine rock series and will, 

 therefore, be encountered ultimately in practically any locality 

 in the Islands if the drilling proceeds to a sufficient depth. 

 Since they are devoid of water, no attempt should be made to 

 continue drilling once these formations are encountered. 



