[ 373 ] 
land, Germany, &c. the waters were fo ftrongly agi- 
tated on the very fame day, it roufed my attention 
greatly, though I am quite loft in conjedture of the 
caufe. You will pleafe to obferve, that it happened 
not here till about 4 p. m. at Portfmouth about 1 1 
a. m. in Holland about 1 1 a. m. at Kinfale, &c. in 
Ireland not till 3 or 4 p. m. , 
LETTER XV. 
From the Rev. William Borlafe, A. M. F. R. S. to 
the Rev. Charles Lyttleton, LL.D. Dean 0/ ExQtQr. 
Reverend Sir, 
Read Dec. 18, Saturday the firft of laft month 
* 755 - [November] happened in Mount’s- 
bay,and the parts adjacent, the moft uncommon and 
violent agitation of the fea ever remembered. At that 
time, and for fix days before, the weather had been re- 
markably calm, the barometer higher than 1 have 
ever noted it for three years laft paft, and in all thofe 
days Farenheit’s thermometer varied only from yi to 
to 54; which is moderately high with us in Cornwall, 
where I have not found it to exceed 64 in the hotteft 
months this year, feldom 60. 
A little after two o’clock in the afternoon, the 
weather fair and calm, barometer at the higheft, ther- 
mometer at f4, the little wind there was being at 
north-eaft, about half an hour after ebb, the fea 
was obferved at the Mount-pier to advance fuddenly 
from the eaftward. It continued to fwell and rife 
for the fpace of ten minutes ; it then began to re- 
tire, running to the weft, and fouth-weft, with a 
rapidity 
