( 2070) 
»i/and A^TsUal '^ if we fuppofe them eachin themfefvcs Equals 
and both perfectly circular and upon Parallell Jxes^ though nei- 
ther of thenijfingly confider'd, would give an Ineqnaliry of mo- 
tion 5 yet the compound of both together, being fwifreft at Mid- 
night and (loweft at Noon/becaufe the compound of both is, in 
/^^/jthe Aggregate^in //jKjthe difference of them) would give us 
twoTydes in each D///r«^/ Revolution : But thofe a) waves at 
Noon.and Mid-night. 
If to thefe we add the Me^Jiruat^ whereby the Earth defcribes 
a fmall Epicycle about the Common Center of Gravity of the Earth 
and Moon 3 and fuppofe thisalfo Equal in it felf. and Circular, a* 
bout an -^x^ parallell to the reft: neither would this, of it felf, 
give any Inequality ; but,compounded with the reft Jt will. For, 
Z/:'^ compounded with the doth, at the New Moon, 
creafet^ at the Full, abate of that motion, as to all parrs of the 
Earth's Surface / But compounded with the Diurnal (which , in 
this cafcjis much the raorc conftderable, as recurring every day ,J 
it doth moft^^^tOjOr^^^/eof^that motion, as to each particular 
place of the Earth's Surface, when the Moon is in the Meridian of 
that place^^e/w or iiiiwe the Horizon ; and would therefore, at 
thofe times^give us two Tydes*(For which, and other particulars 
of like nature, that they maybe the better apprehended, I re. 
fer my felf to the InfpecTticn of the Schemej pertaining to my B/- 
f athejis. ) 
Now becaufe this coming of the Moon to the //er/^sf/^iy, above 
and below the Horizon, or (asSeji me-n call it) the Moons s ott,- 
thihg 2Lnd^orthjng^Aoih\nz^M time, pais round the w hole 
circle of 24 hours ^ hence it comes to pafs, that the time of the 
Tydes doth foalfo; Which I take to| be the true Account of the 
yI/^?/?/?r«^/period«And becaufe thisCompofiiion of the Menfirual 
with the Diurnal Cwhich ieems by the Effeft to be moft predomi- 
nantjthough not to extinguilli the otherj) cafts the time at the 
Mvons being in the Meridian ^ aild that of the Annual and Di' 
nrnal^v^htn the Sun is in the Meridian : When both thefe happen 
at the fame time, as at the Full and Change of the -^ioon j the 
Tydes muft needs be the greater .- Whicii Ltake to be the true 
^Acco^nt of the ^pring'Tj/des^mdNeap'Tj/des. And thus far (which 
is the main of my Hjpotkefis^) he concurs with me, as having givep 
at leaft a very Rational and Probable Account 
If 
