( 20^9 ) 
floudsjthe Tyde flow higher up the River than at other times^this 
muft be derived from fome other caufe. But, that the Tide and 
Land'floud fhould joyntly make a greater Inundation than either 
fingly would have done, is not to be doubted. But he need not 
wondersthat in my fi^^jihough I grant both thefe, ffaid-fe little 
of either, becaufe it was wholly befide :my bufine(s ; which wa% 
to give a account of Stated Periods {Diurptalj Menfimal^ 
Annual,) miingixoTa Regular Motions, not, o£ Jccide^tal Ek- 
travaganceSj fuchasthefeare.' And therefore I did, in the be* 
ginning of that Difcourfe preclude the Confideration of the Ad- 
vantage or Difadvantage, which fhould ariie from fuch uncertain 
Contingencesjas Extrinfecal to that bufinefs. 
His third thwg fuggefted^ The Moms Veng(Bcfu 5 is lb far from 
being contrary to my Hjpothefs^ihu it is a great Fart of it* And 
(if I do not much mif*remember3)it is^in one of my Letters to you, 
exprefly mentioned asfuch.Butforafmuch as it doth not ftill fall 
out at the fame time ofthe Day^MonthjOr Year^I could not make 
it a Component of any of thofe noted Periods, Diurnal^ Menftru- 
^1 or Annual ; (and of more Periods than thefe, I did not know 
that there hath been any general notice taken, of which I might 
think my felf obliged to give an account : ) but it may veiy well 
influence any or all of thofe^according as it falls out advantage- 
ous or difadvantageous for them. 
And as I do fo readily concur with him in a1! the particulars by 
him fuggefted ^ fo I think he will not be difficult in aflenting to 
all the Materials of my Hypothejis. 
The account which I give of the Diurnal md Menfirual Periods 
(from the Common Center of Gravity of the Earth and Moon^) he 
doth allow as very Rational : And confequently (which is the 
Foundationof it,) that any Acceleration or Retardation of the 
Compound motion of the particular parts in the Earth s Surface-, is 
10 give fuch an Accumulation of waters as caufeth a Tyde 5 and 
the Complication of fuch Accelerations and Retardations ^ con- 
curring or interfering one with anotherj doth occafion the per- 
plex Varieties in them: Of which therefore there is no clear ac- 
count to be given^ without confiderlng feverally thepropcrEf- 
feds of eachjfrom whence doth refult the Compound EfFefl: of 
all together. 
Now as to the two moft fignal motions of the Earth, the Diur- 
Bb 2 Ml 
