ILLUSTRATIONS. 



Plate I. 



The slopes of one of the worn down volcanic stocks on Jolo Island. (Photograph 

 by Smith.) 



Plate II. 



Flow lines in andesite at the summit of Mount Apo. (Photograph by Smith.) 



Plate HI. 

 Figs. 1 and 2. Various stages in the eruption of Camiguin Volcano, May, 1871. 



Plate IV. 

 Figs. 1 and 2. The eruption of Camiguin Volcano, May, 1871. 



Plate V. 



Figs. 1 and 2. Metamorphism in a specimen of coal fi-om Dumanquilas Bay, Min- 

 danao. (Photographs by Martin.) 



itAP. 



Geologic map of Mindanao. 



text figube. 



Probable outline of Mindanao in Tertiary times. 



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