[(^8(5] 
fical Moones la <8> and are thefe which occafion the 
greateft flux and reflux i and for the rule of the change 
of the time of high Water, which Mr. Davenport calls a fall- 
ing back of the Tides ^ the example he hath given us, lets 
usknowjthat the ([ in iVbr^A^rw figns^ brings in the fiood 
whilft fhe is above the Horizon, lo as to make high rvattr at 
her fetting, and on the contrary that whilfl: fliee is in Sou- 
thern figns, it flows all the time \\i^moon is below the Ho- 
ri^on^ and fo make high water at her rtjing. But it is to 
be obferved that though the Moon pals fwiftly, from 
South to North whQTL ^aQ is in or near v, and from North 
to South in or near Libra yet the motion o( the 
Sea which is the caufeof this tide^ is fcarce difcernable for 
3 or 4 days, when the Moon paffes the (zid E^uinoilial 
points s whence it appears that though the declination of 
<(,orherdiftancefrom tht EquinoHial^ be that whereby 
thefe T/^^j- are regulated, yet the increafe and decreafe 
ottho^rvater is by no meanes proportionate to that of the 
declination o(Luna,x\iz,X,c\i2iti^mg fwiftly, where the in- 
creafe of the water is obferved to be mofl: flow. It feems 
therefore, and I propofe it as a probable conjedure, that 
the increafe the waters fliould be allways proportionate 
to the Ferfedjignes o( the doubled diftances oSthc Moon 
from the Eg uinoBi a I points^; Upon which Hypothejis Fi- 
gure 9 , will give an elegant Synopjis of the whole matter. 
Let AB be the botto^l of the Bar of Tunking ; CD a per» 
pendicitlar ihQTGto, whereon to meafure the leveral depths 
of the water; Cy, Ci^ the mean depth, which is that 
whereatthe water is ftagnant upon the moons being upon 
iht EguinoBial points^ being commonly about i jfeet: 
C ^ occid, the high water mark when the Moon is in or 
> being about 24 foot. occid the hight of the Low 
water mark when the Moon is in ^ or being about 6 
footi fothatthcgreateflrifeof the^^j^^r on the Tropz- 
^^/Moowj will be about 18 foot i thendividing yCpand 
^ >5 into two equal parts in EF, on thofe two points, as ^ 
Centers, defcribe the 2 Circles^ each of whofe ijf i//Vare 
four 
