696 PHILOSOPHICAL TRANSACTIONS. [aNNO 1755. 



since, that lake rose and fell 3 feet and half, 3 several times, in the space of half 

 an hour. 



LXXFII. Of an Earthquake felt at the Hague, on Wednesday the \Qth of Feb. 



175S. By Mom. Grovestins, Master of the Horse to his R. H. the Prince of 



Orange, p. 544. 



On Wednesday morning, 12 minutes after 8, there was a shock of an earth- 

 quake. His chair received 5 successive shakes. The sconces in the chamber 

 were also moved. Ten or 1 2 minutes after, he perceived a 2d shock, but not 

 so strong as the former. The wind was s.w. Immediately after the earthquake 

 it turned n.e. It was also felt at Maestricht and Utrecht. 



LXXVIII. Of the Same Earthquake felt in Holland, Feb. 18, 1756, In a 

 Letter from Mons. Allemand, Professor of Natural Philosophy at Leyden, and 

 F. R. S. p. 545, 



This article contains observations similar to the preceding one, and also re- 

 marks that the earthquake was felt throughout the whole territories of the 

 republic. 



LXXIX. Of the Earthquakes felt at Brussels; in a Letter from John Pringle, 



M.D., F.R.S. p. 546. 

 By a letter, which Dr. P. received from Dr. Brady, physician to the court at 

 Brussels, he finds they felt in that city this winter 3 several shocks of an earth- 

 quake. The first was on the 26th of December; the 2d on the day following; 

 and the 3d on the 1 8th of February ; being the same day it was said to be felt 

 on our coast, between Margate and Dover ; but the hour is not mentioned. All 

 these shocks he says greatly alarmed the inhabitants; but were otherwise attended 

 with no bad consequences. Dr. Brady adds, that he was told by a gentleman 

 from Liege, that the men who were at work in the coal-pits, and particularly in 

 some of the deepest near that city, had assured him, that they heard the rumb- 

 ling noise preceding the shock as over their heads ; while those who were above- 

 ground heard the same kind of noise as under their feet. 



LXXX. On the Sinking of a River near Pontypool in Monmouthshire. By Air, 



Edivard Matthews, p. 547. 



The 1st day of January 1756, a poor woman, living near the mouth of the 

 river, sent her daughter for water, a great flood appearing in the river just before, 

 who returned in surprise with the account, that it was dry. The river is called 

 by the name of Frooyd, running between two steep hills, or woods, but not very 

 high; "t proceeds from water from the adjacent mountains, and seems penned up 



