Fig. 9. 

 a 



Fig. 9. Feb. 1917. Bottom of lava lake abandoned by subsidence, showing sink- 

 hole cascade. Photos Jaggar. o ttt i? o -ir. 



(a) Feb. '28, 1917. Bottom of lava lake of previous month looking S. W. trom b.H.. 

 margin Halemanman. Depression 115 ft. (3o m.). 



(6) Feb. li, 1917. From S. looking down at sinkhole pit 60 ft. (18 m.) m diameter. 

 Channel from lake in background, cascade deflected by obstruction and falling 40 ft. 



(12 m.); condensation from rising 



sinkhole gases on left. Depression 94 ft. (29 m.). 



Great banners of flame rising above sinkhole visible only at night. 



