35 

 SLftA ON THE CONNEXION OF 



GEOLOGY 



TERRESTRIAL MAGNETISM: 



SHOWING 



THE GENERAL POLARITY OF MATTER, THE MERIDIONAL STRUCTURE 

 OF THE CRYSTALLINE ROCKS, 



THEIR TRANSITIONS, MOVEMENTS AND DISLOCATIONS, 



INCLUDING THE 



SEDIMENTARY ROCKS, THE LAWS REGULATING THE DISTRIBUTION 

 OF METALLIFEROUS DEPOSITS, 



AND OTHER MAGNETIC PHENOMENA. 



BY 



EVAN HOPKINS, C.E., F.G.S. 



" Amid all the revolutions of the globe, the economy of Nature has been uniform, and her laws 

 are the only things that have resisted the general movement. The rivers and the rocks, the seas and 

 the continents, have been changed in all their parts ; but the laws which direct those changes, and 

 the rules to which they are subject, have remained invariably the same."— Playf 'air. 



WITH TWENTY-FOUR PLATES. 



LONDON: 



RICHARD AND JOHN EDWARD TAYLOR, 



RED LION COURT, FLEET STREET. 

 1844. 



