375 
felt in England, 'November 18, 1795. 
are, that of September 30, 1750;* * * § that of September 14, 
1777;^ and that of February 25, 1792.J The earthquake 
of last year was of much greater extent than either of the 
others, consequently a much greater number of counties came 
within its influence ; but there is, to a certain degree, a ge- 
neral analogy in the tract of country affected. It is also ob- 
servable, that the direction assigned to the abovementioned 
three former earthquakes, is nearly the same as that I have 
supposed to have been the direction of the one here de- 
scribed. § This recurrence of earthquakes, in former tracts, 
has been long observed in all countries much subject to them ; 
and has, with great reason, been considered as a strong argu- 
ment in support of the opinion, that their cause is situated 
within the earth. 
It has also been observed in many earthquakes, as in this, 
that, whatever was the state of the wind some time before, 
it was calm at the instant the earthquake happened. This 
has indeed been so generally the case, as to have induced some 
to suppose that wind would prevent a certain accumulation in 
the atmosphere, which, according to their theory, is- necessary 
for the production of an earthquake. || Unfortunately for that 
theory, however, there are more instances than one of earth- 
quakes having happened during a gale of wind.TI 
* Described in the Philosophical Transactions, Vol. XLVI. page 701, et seq. 
f Described in the Phil. Trans. Vol. LX VIII. page 221. 
J Described in the Phil. Trans, for the year 1792, page 283. 
§ See Phil. Trans. Vol. XLVI. page 722 ; Vol. LXVIII. page 227 ; and that for 
the year 1792, page 287. 
|| See Phil. Trans. Vol. XLVI. page 676. 
Dr. Thomas Heber den, in his account of an earthquake felt in the island of 
Madeira, March 31, 1761, says, « though it has been remarked that a calm always 
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