626 



Jaggar — Activity of Mauna Loa. 



fumes rising quietly to a position subtending an angle above 

 the summit about two-thirds as great as that subtended by the 

 summit above the level of Kilauea, hence attaining an altitude 

 of 6000 to 7000 feet above the summit, where a scanty cumu- 

 lus crown of condensed vapor hung. (Fig. 5.) 



Presumably this was condensed water vapor from the atmos- 

 phere. All about it was a very thin, much diffused bluish 

 haze of uncondensed fumes. By day the effect was disap- 



FlG. "). 



T ^ 



m».uima io», Nov ■ab iqiH- 



pointingly slight. Drifting clouds during forenoon and after- 

 noon made seeing uncertain. Toward sundown, however, clear 

 seeing was again afforded. Seen in sunset lighting, partly by 

 reflected, partly by transmitted light, the thin fume curtain — 

 now chiefly a north and a south column — displayed a succession 

 of color tints of distinctly fluorescent character, as follows : (a) 

 just before sunset, with the sun on the mountain profile well 

 south of the summit, the fumes showed a dirty saffron tint, 

 seen largely by reflected light ; (b) at about ten minutes after 

 sunset this had gradually turned to brown, in which a distinctly 

 greenish cast was seen ; it was still a muddy color, though seen 

 largely by transmitted light; (c) about twenty minutes after 

 sunset the tone had become a deep, translucent brown, still of 

 somewhat muddy consistency. 



Seeing in the evening was much interrupted by mist. 

 Meteorological conditions at the summit were unquestionably 

 less favorable for a spectacular display than on the evening of 



