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LXV . Some Account of the extraordinary 
Agitation of the Waters in Mount’s- bay, 
and other Places , on the 3 iy? of March 
1761 : In a Letter to the Reverend Dr . 
Charles Lyttelton, Dean of Exeter, fro?n 
the Reverend William Borlafe, M. A 
F. R. S. 
Reac | I4 > N Tuefday, the 31ft of March 
V_>/ 176 1, about five o’clock in the 
afternoon, there was a very uncommon motion of the 
tide in Mount’s-bay, Cornwall. The Moon had 
entered her lad: quarter on the 28th, at three P. M. 
fo that it was full lea that day, [the 3 i ft] at or about 
half an hour P. M. and the tide (according to the 
reckoning of this neighbouring fhore) juft pad: the lealt 
neap-tide of the laft quarter of the Moon. After the 
tide had ebbed about four hours and half, (for the 
time is not determined with precifion) inftead of con- 
tinuing to retreat gradually, as ufual, till it had com- 
pleted the fix hours ebb, on a fudden it advanced as 
it is ulually at the time of the Moon, at an hour and 
half before high-water. It then retreated nigh to the 
point of low-water, then it advanced again, and re- 
treated, making five advances, and as many recedes, 
in the fpace of one hour; viz. from about five to hx 
o’clock j which was the whole time, that thefe un- 
common ftretches of the tide continued. But the firft 
motion was mod condderable, the lea advancing the 
hrd time to a quarter ebb; but the fecond advance was 
but 
