Jaggar — Activity of Mauna Loa. 



633 



floor were covered with snow, but not the central, southern 

 and north-central parts of the main crater, implying, perhaps, 

 that all of that region was warm. Remnants of the north 

 lunate bench still persist but show change since last year. 

 The north gateway to the crater formed a frame for a striking 

 view of Mauna Kea, with its snow-covered upper cones. 

 (Fig. 9.) 



The party left the summit at 2 p. m. and reached the 



Fig. 9. 



Fig. 9. Northeast wall of Mokuaweoweo, Dec. 15, 1914, showing floor 

 devoid of snow and distant Mauna Kea. T. A. Jaggar, phot. 



lower camp at 5. One of the animals was quite exhausted, 

 owing to feet cut by the rough trail in aa lava, and was unable 

 to hold out through the return trip next day. On December 

 16 we left the camp at 8.45 a. m. and reached the highroad 

 soon after noon. 



The summit glow and fume column on Mauna Loa during 

 the fortnight ending December 24 were visible in clear 

 weather over Mokuaweoweo without marked change. Decem- 

 ber 22 there was a deep mantle of snow on the mountain. 

 (Fig. 10.) The fume column was very clearly visible at the 

 end of December owing to exceptionally transparent air. it 

 made a visible gauge of wind direction on the summit, often 



