t<''d 



Fig, 13. Jan. 26, 1917, 6 p. m. Series of photograi^hs, "Wrntten Panchro- 

 matic plate, aperture F 6*8, exposure 1/85 sec: lava fountains 100 ft. distant 

 in N. cove of Halemanman, observer standing on E. point (see fig. 2). Pro- 

 longed migratory type of fonntaining. Depression 50 ft. (15 m.). 



(a) Shows sub-crnstal explosions breaking surface ; note high viscosity 

 and depression in crnst. 



(6) Second stage, flinging and spraying, area elongated with migration to 

 the right, actual fountain 40 ft. (12 m.) long. 



(c) Blowing and flaming, with increased elongation, diminished viscosity, 

 and down-suction. 



(c?) Termination of fonntaining against wall in background, with exf)ulsion 

 of gas, flames, and much production of filamentous glass. In taking these 

 pictures the writer was at the edge of the lake to leeward of its whole cen- 

 tral region, but was not at all inconvenienced by the gas from its smaller 



