ILLUSTRATIONS. 



Plate I. Mount Apo as seen from Davao Gulf. 

 II. A meander of the Eio Grande. 



III. Topography along the Tagoloan River. 



IV. Panorama of the Lanao upland. 



V. Islands off the north coast of Jolo. 

 VI. Map of the Island of Jolo. 



TEXT FIGURES. 



Fig. 1. Sky line south of Cotabato. 



2. Profile from Camp Overton to Malabang. 



2. Sketch of topography near Lake Lanao, showing the Keithley escarpment. 



4. Outline map of Mindanao, showing Cordilleras and principal drainage lines. 



5. Terraces at the mouth of the Cagayan River. 



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