2SO 



PLATE CLVIL THE "SMOKE" OF MOUNT EREBUS AS A 



WIND-VANE. 



From a pencil sketch, representing the condensed steam of Mount Erebus, emitted, 

 as it almost always was, in a series of rounded puffs, to be carried away 

 by the upper currents of air in the form of a long pennant. 



At this height, 12,922 feet, it was of great value as a wind-vane, enabling 

 us to record the direction of upper currents of air, which often differ from those 

 observed at sea-level, and amongst the highest clouds. 





