EARTHQUAKE PHENOMENA. • 433 



is capable of adding much to our knowledge of chemical and physical 

 geology. 



Perhaps no branch of terrestrial physics will so richly repay to the 

 observer, who is so fortunate as to be able to reach the greater seats 

 of volcanic and seismic action of our globe, the labor that will be 

 necessary beforehand to enable him effectually to grasp his subject, 

 as seismology; but observations undertaken without such preliminary 

 knowledge will, for the most part, be valueless. 



Besides the study of the several works already mentioned in the 

 text, Lyell's "Geology," passim, should be studied, and a few of the 

 best narratives of earthquakes perused. Such are Hamilton's and 

 Dolomieu's " Accounts of the Great Calabrian Earthquake," (neglect- 

 ing their theoretic views;) Humboldt's, Admiral FitzRoy's, and C. 

 Darwin's Accounts of the South American, and Sir Stamford Raffles's 

 Account of those of Java; with several others. 



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