PLATE I. 



A. Panoramic photograph of Halemaumau on January 13, 1910, with 

 Rlauna Loa in the background. The nearly circular lake was about 200 me- 

 ters in diameter; its surface was estimated to be about 25 meters below the 

 rim of the crater. Copjright by E. Moses, Hilo. 



B. Panoramic photograph of Halemaumau on February 20, 1910. Lake 

 level fallen about 30 meters below the surface of the "black ledge" in the 

 foreground. Copyright by E. Moses, Hilo. 



