OF CORNWALL. 55 
it can farce be imagined, that a fliock, To far off as the coaft of 
Spain, could be fo immenfe as to propagate fo violent a motion of 
the water quite home to tne ihores of Britain in lefs than five hours- 
I mould rather dunk that the fame caufe, diffufed in difterent por- 
tions through the inteftines of the earth, produced feveral fubfequent 
lare.adtions of the imprifoned vapours; that thefe rarefied tumid 
vapours affefled the Seas and land above them in proportion to their 
own power, the dimenfions of the caverns they had to extend them- 
felves in, and the fupenour or fainter refiftance of the incumbent 
preffure. But though at this time no motion of the earth was per- 
ceived, nor any noife in the air, yet Cornwall can give a recent 
lmtance or both. 
On Friday the *5* of July, 1757, a violent (hock of an Earth- 
quake was felt m the Weftern parts of Cornwall. 
Tne Thermometer had been higher than ufual, and the weather 
hot or calm, or both, for eight days before ; wind Eaft and North- 
qu l4t V n tbe mornin g> the wind drifting to the 
South-Weft, the weather ealm and hazy, there was a ftrower • the 
afternoon hazy and fair, wind North-Weft ; the Barometer mode- 
rately high, but the Mercury remarkably variable. 
9 11 ^ I 5 t hj in the morning, the wind was frefh at North- 
Weit, the atmosphere hazy, being on the fands z , half a mile Eaft 
of Penzance, at ten a. m. near low-water, I perceived, on the fur- 
face of the fands, a very unufual inequality ; for whereas there are 
feldom any unevennefles there, but what are made by the rippling 
°£ r u W f e r’ , f °' ^ fands ’ for abwe a hundred yards fquare, 
all full of little tuberc.es (each as large as a moderate mole-hill), 
and in the middle a black fpeck on the top, as if fomething had 
ihued there ; between thefe convexities, were hollow bafons of an 
equal diameter ; from one of thefe hollows, there ifthed a ftrong 
ruih of water, about the bignefs of a man’s wrift, never obferved 
there either before or fince. 
About a quarter after fix, p. m. the iky du/ky, the wind being 
at Weft North Weft fell quite calm; about half paft fix, being 
then in the fummer-houfe at Keneggy, the fat of the Honourable 
J. Harris, Efq; near Penzance, with fome company, we were fud- 
enly alarmed with a rumbling noife, as if a coach or waggon had 
pafied near us over an uneven pavement ; but the noife was as loud 
in the beginning and at the end, as in the middle, which neither 
the found of thunder or of carriages ever is : the fafh cafements 
jaire , one gentleman thought his chair moved under him, and the 
with Ten oAwel dde ‘ S T are ™ VCr , ed tide is out > afford an area of three miles long, and 
et of water j but when the about a furlong wide, of i'moofh, firm fands. 
gardener, 
