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Ch. XXX.] 



SHOCKS AT SILi. 



149 



Great Britain. The thermal springs of Toplitz dried up, and 

 a<^ain returned, inundating everything with water discoloured 

 by ochre. In the islands of Antiaaia, Barbadoes, and Mar- 



West 



more than 2 feet, it suddenly rose above 20 feet, the water 

 being discoloured and of an inky blackness. The movement 

 was also sensible in the great lakes of Canada. .At Algiers 

 and Fez, in the north of Africa, the agitation of the earth 

 was as violent as in Spain and Portugal ; and at the distance 



Morocco 



number 



been swallowed up ; the earth soon afterwards closing over 

 them. 



Sliocl^s felt at sea. — The shock was felt at sea, on the deck 

 of a ship to the west of Lisbon, and produced very much the 

 same sensation as on dry land. Off St. Lucar, the captain 

 of the ship Nancy felt his vessel so violently shaken, that he 

 thought she had struck the ground; but, on heaving the 

 lead, found a great depth of water. Captain Clark, from 

 Denia, in latitude 36'' 24' N., between 9 and 10 in the 

 morning, had his ship shaken and strained as if she had 

 struck u]3on a rock, so that the seams of the deck opened, 

 and the compass was overturned in the binnacle. Another 

 ship, 40 leagues west of St. Vincent, experienced so violent 

 a concussion, that the men Avere thrown a foot and a half 

 perpendicularly up from the deck. 



Rate at which the movement travelled.— 



—The agitation of 

 lakes, rivers, and springs, in Great Britain, was remarkable. 

 At Loch Lomond, in Scotland, for example, the water, with- 

 out the least apparent cause, rose against its banks, and then 

 subsided below its usual level. This is explained by sup- 

 posing that the water does not partake of the sudden shove 

 given to the land, so that it dashes over that side of the 



■ 



basin from which, the shock is given. The greatest perpen- 

 dicular height of the rise in Loch. Lomond was 2 feet 4 

 inches. It is said that the nndulatorj movement of this 

 earthquake travelled at the rate of 20 miles a minute, its 

 velocity being calculated by the intervals between the time 



I 



