lefs tbaadoe (pmtt of aa bcHirs dij^reoce ; which 
fidering how difficult it is tp determine the Time of an 
Wgh-Water cxaaiy, Icannotbut efteeip a very good A- 
greement. 
Hitherto our Tide-Tables have only Chewed the time of 
that one High'voater which next follows the Moons South- 
ings but in this new Tit^/e I have given the times of both, 
concerning which, I delire it may be noted. 
That when by realbn of great Droughts in Summer ^ot 
extreme ^roUs in Wint^t^ the Springs are low, and the 
Frejh Waters Ic(s than u(ual, the Tidts may hold up long«« 
er than the Times noted in the table 5 as alfo when ftrong 
fJorth'^eJlerfy or Northerly Winds blow, which bring in 
an Extraordinary Floud from the Northern Seas find keep 
it up longer than other times. 
So on the contrary, when the Winds blow hard on the 
Oppojite Points of the Compa/^ or when we have much 
Main and great Frepes^ the Tides hold not out fo long as 
the Times (hewed in the Tabky the Frejbes overpowring 
and checking them fooner 5 Yet have I never found that 
the differences betwixt the Calulated and obferved High- 
Waters have much exceeded half an hour 5 Moft com- 
monly they are fcarce half fo much. 
Th\%Table may be reduced and made to ftrveforany 
other Port of His Majefties Dominions or Neighbouring 
Countrys, by only fubftrafting or adding fo much time 
to the High' Waters noted in ir, as the High-Water ob- 
ferved in the faid place ftiall be found to precede, or 
follow the Time of the High-Water the fame Day herein 
noted. For by fuch Accounts as I have met with and 
received of the Tides in remote Places, I find there is 
every where, about £^^W<j/,th€ feme difference betwixt 
the Spring and Nsap-Ttdes^ that is here obferved in the 
River of Thames. 
I could eafily have made and given you a Table for this 
ReduBzon^ if I durft have relied, on the Account our Ma- 
finer s give of the Tides in other Ports, but I find their 
Opinions different, except where they have copied from 
one another in their K^/e^^/^r/, by reafon of the afore- 
mentioned difference betwixt the Times of the Moons 
southings^ 
