226 Mr. King’s Account of a Subfidence 
ns the valley between the hill FI and the finking of the ground 
A A. 
That the finking of the ground is caufed by the foundation 
being undermined (and I think by water) is evident from the 
appearance of the ground in the valley. The foil is full of 
fiffures, and refembles an arch, which is funk down, and has left 
the two abutments, the hill H and the cliff DD; handing. 
As the hill H more than counter-balances the preffure of 
the finking ground upon the ftratum of wet marie, the confe- 
quence is, that the rocks KK, at fome yards diffance, being 
only thinly covered with fand, are forced upwards, and become 
vifible, and the wet marie in many places is fqueezed through 
the land with them. 
This appears to me to be the true reafon of the finking of 
the ground at one place, and the rifing of the rocks at 
another. 
That the reverend Mr. Sackette’s account of the finking 
of the ground at Folkftone, to the Royal Society* is founded in 
error, I have not the lead: doubt, from the prefent appearance 
of fome of the obje&s he defcribes. I am rather at a lofs to 
follow him exaftly, as the oldeft man in the town of Folk- 
hone (I am told) never heard of the Mooring-rock he 
mentions. . 
I think by his aefcription the finking of the ground muft 
have been in his time at the fame place it is now* as Tarling- 
ham-houfe is not to be feen on the other fide of the town. 
Admitting this to be the cafe, there will ftill be a difficulty 
refpe£ling the relative fituation of each place in explaining 
what he calls a Iketch of the country. But, to explain 
my meaning more fully* let B (Tab. V.) reprefent the 
foot 
