2 7 8 



PLATE CLVL MOUNT EREBUS AS CLOUD-PRODUCER. 



From a pencil sketch, representing the " smoke " or condensed steam emitted from 

 the crater at the summit of Mount Erebus. 



The appearance of distinct columns rising from separate vents was unusual, 

 and became possible only when a dead calm prevailed, 12,922 feet above sea-level. 

 The collection of the condensed steam at a still higher level to form a cloud-mass 

 was less unusual. 



Compare Plates CLVII. and CLVIII. 



