but to one of the two Tides 5 that is, the Night-tide at the New* 
moon ( when both motions do moft of all Accelerate, ) and the 
Day-tide at Fuli-moon ( when both do moft Retard the Annu* 
al motion;) let, this tide being thus raifed by two concurrent 
caufes £ though the next Tide have not the fame caufe alfo, the 
Impetus contracted will have influence upon the next Tide - ; 
Upon a like reafon, as a Pendulum let fall from a higher Arch* 
wilf( though there be no new caufe to occafionir) make the 
Vibration on the other flde (beyond the Perpendicular) to- 
be alfo greater ; Or, of water in a broad Veffel, ifitbefojog- 
ged.as to be caft forward to a good height above its jbevell.wilT 
upon its recoyling, by its own gravity, (" without any addition 
nal caufe ) mount Co much the higher on the hinder part. 
But here alfo we are to take notice , that though all parts of 
the Earth by its Diurnal motion do turn about its Axis, and d£*~ 
feribe par allel Circles ; yet not equal Circles , but greater neer 
the AZquine&ialy andlejftr near the Poles , which maybe a caufe 
why the Tides in forne parts maybe much greater than in o- 
thers. But this belongs to the particular coafiderations , (of 
which we are not now giving an Account : ) not to the general 
Hypothecs. 
paving thus endeavoured to give an account of the Pmrnal 
and Menjlrual Periods of Tides ; It remains that I endeavour 
the like as to the Annual: Of which there is, at leafti thus much 
agreed ; That, at fome times of the year* the Tides are noted! 
to be much higher, than at other times. 
But here I have a double task j Fir (l, to rectify theObfer- 
vation • • and then , to give an account of ifi 
As to the Firfl 5 It having been obferved (grofly ) that thole* 
high Tides have ufed to happen about the -spring m&Autumnr. 
at hath been generally taken for granted ( without any more 
nice obfervation ) that the two AL equinoxes are the proper times, 
to which thefe Annual highTides are to be referred * . And fuch i 
caufes fought for, as might beft fute with Inch a SuppofltioH . 
But it is now, the beft part of twenty years, lince I have had I 
frequent occasions to converfe with feme Ifihabitants of Ttym* 
my-marjhm iQntj where the Sea being kept out with great 
Earthen walls, that it do* not at high- water overflow the He yell ; 
and! 
