152 



SCIENCE 



[N. S. Vol. XLII. No. 1074 



X'^'?'^ 



Fis. 2. The pit of Halemaumau on March 15, 1915. In the main lake, the northwest pond, and a 

 small southeast pond (SE.), the general directions of the currents in the lava are shown by arrows. 

 The collapsed 1914 floor is greatly fissured and broken up into blocks which can not be represented 

 here. The cross-section A-B shows the remnants of the 1914 floor. The elevations given are above 

 sea-level; the depths are below the rim. 



southeast end and from the main lake. This 

 rush lasted for an hour, and at noon the lake 

 became quiet, indicating a rise. On the 3d, the 

 lava streamed from the middle, both east and 

 west, and a torrent poured into the southeast 

 arm which maintained a level several feet 

 below the lake. 



The activity in March in the main lake has 

 been very much as during the last of February. 



Portions of the lake have been frozen at times, 

 especially the east-central portion, only to 

 break up suddenly, when a fountain developed 

 at the side of the lake, and the crusts streamed 

 toward the fountain. On several days lines 

 of fountains have been observed toward which 

 crusts were drawn, and sometimes the whole 

 line migrated to the margin of the lake to 

 form a spatter-fountain. The most persistent 



