[ 643 ] 
no leifure for accurate obfervation, nor could any one 
inform me of the exadl diftance from the time of the 
fir ft fwell till the waters rofe to the height of fix feet, 
fome fpeaking of four, others of five or or fix mi- 
nutes. 
It is to be obferved, that the like phenomenon 
happened on the i ft of November laft, and the wa- 
ters then rofe to the fame perpendicular height. 
XCVII. ExtraSl of a Letter fro?n the Rev . 
Mr . Holdfworth, at Dartmouth, re- 
lating to the Agitation of the Waters ob- 
ferved there on the ijl of November, 
1 7 5 5 . Communicated by the Rev. Jere- 
miah Milles, D. D. F. R. S. 
Read May 13, nr ]q ave enquired particularly of our pj- 
17 s6 ‘ lot-men, and others concerning the 
tides in this harbour, who unanimoufly, agree that 
there was a furprizing agitation in the waters about 
nine in the morning on the firft day of November 
laft, when there was a great and fudden fwell ; and 
though there was but little wind, yet the boats, riding 
near the mouth of the river, tumbled and tofted as 
if they would have leaped into each other ; and two 
of them broke loofe from their moorings. During 
this fermentation (or boiling of the fea like a pot, 
as my informant expreffes himfelf) though it was 
four hours ebb, the waters rofe as high, or higher 
than they ufually do on the higheft fpring tide. This 
violent 
