Jaggar — Activity of Mauna Loa. 



637 



Kilauea was intensely active and in general rising all 

 through December, and in accordance with the measurements 

 of preceding years it was fully expected at the Observatory 

 that it would sink in January. The movements of the lava 

 column, though as a whole lower, have been remarkably paral- 

 lel to those of 1911-12, when also there was a maximum on 

 January 4. 



There was glow over Mokuaweoweo January 6, 1915, and a 

 tuft of fume like white cotton appeared on the morning of 

 January 7, apparently blowing away to the west. For the 

 previous fortnight there had been no marked changes, except 



Fig. 13. 



\ 



N\MJlM/y LOAi DEC 50 l^lM- 



that a diffuse glow had appeared at night distinct from the 

 light reflected from the obvious fume cloud, and frequently 

 in the air around the fume column. This was attributed to 

 atmospheric conditions. At and around 2 p. m. January 6, 

 streamers of white cloud rose in tufts from the higher cone 

 region on the northeast slope of Mauna Loa, quickly disappear- 

 ing and having no resemblance in color to the fume. On Jan- 

 uary 7 between 1 and 2 p. m. the same thing happened again, 

 mostly above the snow-line, along the northeast cone line, and 

 at one time over Mokuaweoweo itself, the color of the white 

 tufts being quite distinct from blue fume against which they 

 showed. At 3:30 p. m. these white jets were still at work 

 near the two upper cones where similar jets have been seen 



Am. Jour. Sci. — Fourth Series, Vol. XL, No. 240. 

 43 



-December, 1915. 



