(27$) 
but CO one of the two Tides , that is,the Night-tide at the New- 
moon ( when both motions do moft ofall Accelerate, ) and the 
Day-tide at Full moon ( when both do moft Retard the Annu-' 
al motion ;) Yet, this tide being thus raifed by two concurrent 
caufcs J though the next Tide hare not the fame eaufe alTo, the 
j Impetus contradled will have influence upon the next Tide | 
Upon a hke reafonj as 2i Pendulum Xct fall from a higher Arch, 
will ( though there be no new caufe to occafionit) make the 
Vibration on the other fide (beyond the Pcrpendrcuiar ) to 
be alfo greater : Or, ofwaterin a broad Veffelj if it be fo jog- 
ged,as to be caft forward to a good height above its Levell, will 
upon its rt coy hngy by its owngravity, ( without any additio- 
nal caufe ) mount fo much the higher on the hinder pari; 
But here alfo we are to take notice , that though all parts of 
the Earchby its Diurnal motion do turn about its AxiSj and de« 
fcribe /?^r^fo/ Circles 5 yet not equal Circles 5 hut greater n^QV 
the jEquineHialy and lejjer near the Poles ^ which may be a caufe 
why the Tides in fome parts may be much greater than in o- 
thers. Bu^this belongs to iho particular confiderations , (of 
which wc^re not now giving an Account : ) ; not to the gemrdi 
HypotheRs. 
Havirig thus endeavoured to give an account of the Pmmal: 
and Menjirual Periods of Tides 5 It remains that I endeavour 
tte like as to tho jitmuaL Of which there is, at Ieaft,ihus much 
agreed ; > That^ at fome times of the year, the Tides are^noted i 
to hQ much higher, . than at other times. 
But here 1; have a double task 5 F/>/?,. toredHfy the Obfer- 
vation 5 and then, to give an account of it^, . 
V As to the Firjl'y It having been obferved (grofly) thatthofe 
high Tides have ufeci to happen about the ^/?ri;a^ ^nd Jutumn ^ ^ 
\ it hath been generally taken for granted (without anymore 
nice obfervation ) that t\\Q t^^o Mquimxes are the proper rimes, 
ta which the(e^««/i/^^^^^ Ti?^jr are to be referred - And fiich^ 
<:aufes fought for, as. might beft fute with luch'a SuppofitioB. 
Rat iris now, the beft part of twenty years, fince I have liad ^ 
, ! frQc^ent ocoafions to converft with fame Inhabitants of J^/zw- 
^jy-/7aiiry?j ill \yhere the Sea being kept out with great: 
I ^artbgq walls, ttat it do not at high- water overflow the Level U 
audi 
