Lesson xxxv.] EARTHQUAKES. 253 



served. At Haerlem, in the forenoon, tor nearly 

 four minutes together, not only the water in the 

 rivers, canals, &c. but also all kinds of fluids in 

 smaller quantities, as in coolers, tubs, backs, 8cc. 

 were surprisingly agitated, and dashed over the 

 sides, though no moton was percepnble in the 

 vessels themselves. In these small quantities also 

 the fluid apparently ascended prior to its turbulent 

 motion; and in many places, even the rivers and 

 canals rose tv\elve inches perpendicularly. 



The agitation of the waters was also perceived 

 in various parts of Great Britain and Ireland. At 

 Barlborough in Derbyshire, be i ween 11 and 12 in 

 the forenoon, in a boat-house on the west side of 

 a large body of water called Pibley Dam, sup- 

 posed to cover at least thirty acres of land, was 

 heard a surprising and terrible noise; a large swell 

 of water came in a current from (he south, and 

 rose two feet on the sloped dain-head at the north 

 end of the water. It then subsided; but returned 

 again immediately, though with less violence. The 

 water was thus agitated for three quarters of an 

 hour; but the current grew every time weaker and 

 weaker, till at last it entirely ceased. 



At Busbridge in Surrey, at half an hour after 

 10 in the morning, the weather being remarkably 

 still, without the least wind, in a canal near 70O 

 feet long and 58 reet broad, with a small spring 

 constantly running through it, a very unusual 

 noise was heard at the east end, and the water 

 there observed to be in great agitation. It raised 

 itselt in a heap or ridge in the middle 5 and this 



heap 



