I 3SI ] 
' LVIII. An extraordwary and J^rprifing Agitation 
of the Waters^ though * without any perceptible 
Motion of the Earthy having been obferved in va- 
rious Parts of this If and ^ both maritime and iti- 
landy on the fame Day^ and chief y about the Time^ 
that the more violent Commotions of both Earth and 
Waters fo extenftvely affedied many very difant 
Parts of the Globe-, the following Accounts^ re- 
lating to the former, have been tranfmittcd to the 
Society ; in which are fpecifed the Times and Places 
when and where they happened. 
\ 
LETTER I. 
From Mr. John Robertfon, F. R. S. to Tho. Birchj . 
D. D. Secret. R. S. 
At Portfmouth, in Hampfhire, 
SIR, 
Read Nov. 27, H E firft notice I had of any 
common motion of the waters in 
the docks at Portfmouth, was by the Whitehall Even- 
ing-Poft ; and as I did not hear any particulars from ’ 
my acquaintance in the yard, I thought no more of • 
it. But on the receipt of your letter I made a mi- 
nute inquiry among the perfons, who faw it, of whom • 
there were many, and the fubRance of their informa- 
tion is as follows. 
On Saturday, Nov. i, I755> about 35 minutes 
after ten in the morning there was obferved in the 
* See the note on the letter frona Rr Philips. - 
dock* 
