528 The Philippine Journal of Scieiice 



In conclusion, we find in Leyte bituminous rock an excellent 

 natural paving material from local sources which fortunately 

 exists in quantities sufficient not only to satisfy local needs but 

 also for exportation. Slight defects of this material could be 

 remedied, as we have seen, by the introduction of proper fillers 

 and fluxes, according to requirements. 



The natural solid bitumens occurring in Leyte Province have 

 been classed as "pure bitumen" and bitumen-impregnated rock, 

 and have been studied from a chemical and physical standpoint 

 showing : 



1. That Leyte pure bitumen differs from other mineralogical 

 deposits of bitumens, such as ozocerite, montan wax, hatchettite, 

 and scheererite, but is related to ozocerite. It is suggested that 

 the pure bitumen of Leyte be termed leyteite. 



2. That the chemical and physical properties of the bitumen 

 found in the impregnated rock differ from those of the pure 

 bitumen. 



3. That the mineral aggregate of the bitumen-impregnated 

 rock is principally limestone. 



4. That the bitumen-impregnated rock would be suitable 

 paving material, both in its natural state and after the intro- 

 duction of fillers and fluxes. 



