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Ch. XXIX.]- EFFECTS OF CALABRIAX EARTHQUAKE. 119 



is mentioned as a well-known fact by Dolomieu; and lie 

 assures us that lie was always on his guard against the spirit 

 of exaggeration in which the vulgar are ever ready to indulge 

 when relating these wonderful occurrences. 



The reader must not suppose that these waves, although 

 described as passing along the solid surface of the earth in a 

 o-iven direction like a billow on the sea, have any strict 

 analogy with the undulations of a fluid. They must be 

 regarded as the effects of vibrations, radiating from some 

 Jeep-seated point, each vibration on reaching the surface 

 lifting up the ground, and then allowing it again to subside. 

 The manner in which the vibratory jar reaches different 

 points of the surface in succession according to the outline 

 of the country, will be explained in the sequel, see p. 136. 



Fk. 109. 



Shifts in the stones of two obelisks in tlie Convent of S. Bruno. 



The Academicians relate that in som'e of the cities of 

 Calabria effects were produced seeming to indicate a whirling 

 or vorticose movement. Thus, for example, 



two obelisks 



maornificent 



the convent of S. Bruno, in a small town called Stefano del 

 Bosco, were observed to have undergone a movement of a 

 singular kind. The shock which agitated the building is de- 

 scribed as having been horizontal and vorticose. The pedestal 



* L 



remained 



sometimes 



partially 



