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PLATE CLXIII AURORAL CORONA. 



From sketches and observations made on April 8, 1903, at 2 hr. A.M. ; looking to 

 the zenith, M'Murdo Sound. 



The sketch is intended to give an idea of the culmination of moving arcs and 

 curtains and beams of light in the zenith, where occasionally the appearance of 

 radiation from a centre, or of revolution, slow and changeful, about an axis, is given 

 to the onlooker. Such evanescent figures, almost impossible to describe in words, 

 are even more difficult to suggest with any approach to truth, in pictures ; they are 

 spoken of as "coronse." 



