r 374 ] 
iapidity equal to that of a mill- ftream defcending to 
an underfliot-wheel ; it ran fo for about ten minutes, 
till the water was fix feet lower than when it began 
to retire. The fca then began to return, and in ten 
minutes it was at the before-mentioned extraordinary 
heigiit; in ten minutes more it was funk as before, 
and fo it continued alternately to rife and fall between 
live and fix feet, in the fame fpace of time. The 
hrll and fecond duxes and refluxes were not fo vio- 
lent at the Mount-pier as the third and fourth, when 
the fea was rapid beyond expreflion, and the altera- 
tions continued in their full fury for two hours : they 
then grew fainter gradually, and the whole commo- 
tion ceafed about low water, five hours and an half 
^ter it began. 
Penzance pier lies three miles weft of the Mount, 
and the reflux was firft obferved here 45 minutes 
after two : the influx came on from the fouth-eaft, 
.and fouth-fouth-eaft : from whence I gather, that 
the force, from which this agitation proceeded, lay at 
fouth nearly, or fouth-weft of this bay, and the fea 
reaching firft the eaftern lands (which project a great 
deal more than thofe of the weft), was thence re- 
fledled, .and came upon the Mount in an eafterly di- 
rection : but farther on to the weft this eaftern cur- 
rent had loft its ftrength, and the fea came into Pen- 
zance from the fouth-fouth-eaft more direClly from 
the point of its momentum. Here the greateft rife 
was eight feet, and the greateft violence of the agi- 
tation about three o’clock. 
Newlyn pier lies a mile weft of Penzance. Here 
the flux was obferved firft, as at the Mount, and 
came in from the fouthward (the eaftern current be- 
ing 
