246 LIGHT SCIENCE FOR LEISURE HOURS. 



pel us to confine ourselves to two or three. The slow 

 processes of upheaval or depression may, perhaps, seem 

 less immediately referable to subterranean action than 

 those which are produced during the progress of an 

 actual earthquake. We pass over, therefore, such phe- 

 nomena as the gradual uprising of Sweden, the slow 

 sinking of Greenland, and (still proceeding westward) 

 the gradual uprising of Nova Scotia and the shores of 

 Hudson's Bay. Eemarkable and suggestive as these 

 phenomena really are, and indisputable as the evidence 

 is on which they rest, they will probably seem much 

 less striking to our readers than those which we are 

 now about to quote. 



On the 19th of November, 1822, a widely-felt and 

 destructive earthquake was experienced in Chili. On 

 the next day, it was noticed for the first time that a 

 broad line of sea-coast had been deserted by the sea 

 for more than one hundred miles. A large part of this 

 tract was covered by shell-fish, which soon died, and 

 exhaled the most offensive effluvia. Between the old 

 low-water mark and the new one, the fishermen found 

 burrowing shells, which they formerly had to search 

 for amid the surf. Rocks some way out to sea which 

 had formerly been covered, were now dry at half ebb- 

 tide. 



Careful measurements showed that the rise of the 

 land was greater at some distance inshore than along 

 the beach. The water-course of a mill about a mile 



