SUNSET ILLUMINATION. 187 



for sunsets of extraordinary brilliancy are remote from 

 active volcanoes. So far as South America is con- 

 cerned, it may, on the other hand, be remarked that 

 if volcanic action be an efficient cause, it is present 

 at many points of the continent as well as in Central 

 America, while brilliant sunsets are, so far as I know, 

 of rare occurrence except in Chili. 



