Dalburg and Pratt: Bulacan Iron Ores.] 



[Phil. Journ. Sci., IX, A, No 3. 



Fig. 1. Magnetite vein in limestone, Camaching. 



Fig. 2. Inclusions of limestone in iron ore, Camaching. 



Fig. 3. Diabase ( ?) dil<e in diorite, Bayabas River; quartz filling along fractures. 



PLATE III. 



