636 



Jaggar — Activity of Mauna Loa. 



illumined fume-column but a marked radiant glow spreading 

 upward in the atmosphere above the summit fountains. 



January 3, very small puffs of fume showed, apparently 

 blowing west, and this continued January 4, the nights showing 

 the radiant glow and occasionally the low illumined fume. 

 January 5 was similar, but the fume dome rose higher and at 

 night there was a high luminous zone and rare glimpses of the 

 fume top. There was fresh snow on the mountain. January 

 6, the fume was blowing northwestward. 



By the middle of January every expectation based on the 

 hypothesis that Hawaiian volcanoes respond to the solstice and 



Fig. 12. 



MAVJNfr, UOA OEC 21 l^'M- 



subside thereafter, was fulfilled, for the lava of Halemau- 

 raau was rapidly sinking and on January 11 the fume column 

 and glow of the Mokuaweoweo fountain ceased. 



The time of the solstice, or maximum declination of the sun 

 south, was from December 20 to 21 inclusive, the turning 

 point being reached December 22; calling the eruptive period 

 of Mokuaweoweo forty-eight days, from November 25 to Jan- 

 uary 11 inclusive, the middle day of the period, twenty-four 

 days after the outbreak, was December 18-19. January 1, 

 1915, appears to have been the date of highest tide in Hale- 

 maumau, when the last overflows of the lake took place at an 

 elevation 363 feet below the southeast rim of the pit ; on Jan- 

 uary 13 the lake had fallen about thirty-five feet below this, 

 or 398 feet below the rim. 



