ILLUSTRATIONS. 



Plate I. Map of Mindanao. 



II. Map of the Sulii Archipelago. 



III. Schists in the Tumaga River, Zamboanga. 



IV. Sandstone slightly schistose in the Tumaga River, Zamboanga. 

 V. Volcanic agglomerate in the Tumaga River, Zamboanga. 



VI. Siibanuns. 



^'II. Beach and terrace just north of San Ramon, Zamboanga Peninsula. 

 VIII. Datu Lukas seated before his house. 

 IX. Flat-topped crater of an extinct volcano near jMaibun trail. 

 X. View of Bud Dajo from the INIaymbung trail. 

 XI. Palace of the Sultan of Sulu. 

 XII. A Moro village near Jolo. 



XIII. Slopes of Suliman-tangis, -Jolo, P. I. 



XIV. Mount Vigia from the dock at Bongao. 

 XV. Old Spanish fort at Isabela. 



XVI. View toward Tomontaca (south), valley of the Rio Grande. 

 XVII. Panorama of the lower part of the valley of the Rio Grande. 

 XVIII. A native salt-making establishment on the lower Rio Grande. 

 XIX. Mearns' resthonse at 1,.800 meters' altitude on Mount Apo. 



XX. The summit of Mount Apo. 

 XXI. Showing oeneentric weathering in igneous rock. .. 



XXII. Map of route from Cotabato Valley to Davao Gulf. 

 XXIII. Map of route from Davao Gulf to ilount Apo. 

 Fig. 1. (In the text.) Elevation of a cotia. 



2. (In the text.) Valley with steep sides. 



3. (In the text.) Valley with flaring sides. 



4. (In the text.) Profile of Mount Apo. 



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