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Notices of Earthquake- shocks felt 171 Great Britain^ and espe- 

 cially in Scotland, with inferences suggested by these notices 

 as to the causes of the Shock. By David Milne, Esq., 

 F.R.S.E., M.W.S., F.G.S., &c. Communicated by the 

 Author. 



(Continued from Vol. XXXV. page 159.) 



Having now fully detailed the phenomena attending the 

 shock of 23d October 1839, and suggested the inferences as 

 to the probable cause of such shocks, which these phenomena 

 seem to warrant, we shall proceed to describe shocks of a 

 subsequent date, offering also, in regard to them, such re- 

 marks as may be suggested by the effects observed. 



8//* January 184U. — The shocks under this date, as felt at 

 CoMRiE, appear from the Register kept there * to have been 

 very slight. 



On the same day, about 10 p. m., a shock was felt in 

 Ireland, which, perhaps, it is not out of place to notice. 

 An account of it was transmitted by Mr Paterson of Belfast, 

 from which the following extracts are made. " The shock 

 was most felt in the barony of Innishowen. This barony, 

 which is the northern extremity of the county of Donegal, 

 forms a peninsula, lying between Lough Foyle on the east, 

 and Lough Swilly on the west. The sound by which the 

 shock was accompanied, was heard in the parish of Cloncha, 

 20 miles north of the city of Londonderry ; and also in the 

 several parishes of Moville, Culdaff, Donagh, Clonmany, and 

 Fahan. The duration of the shock is estimated at about 20". 

 The vibration of the ground was very sensibly felt, especially in 

 high and rocky situations, and but slightly in low and marshy 

 grounds. It is compared to the kind of tremor caused by the 

 passing of a loaded cart. No building of any kind was injured 

 by it, nor was any wall cracked or thrown down. It seemed 

 to proceed from E. to W. or from NE. to SW. The shock 

 at Malin is stated to have been ' heaviest' at the commence- 

 ment and termination ; perhaps, by a well-known law of mo- 



* See page 85. 



