( 2 ^>) 
Kow this premised, We ar znext, with him, to fuppofe the 
Earth carried about with a double motion $ The one Annual y as 
( Hg- i. ) in B E C the great Orb, in which the Center of the 
Earth B 3 is fuppofed to move about the Sun A . 
The other Diurnal , whereby the whole moves upon its own 
Axis , and each point in its furface deferibes a Circle, as 
DEFG, 
It is then manifeftjthat if we fuppofe, that the Earth moved 
butby any one of thefe motions, and that regularly* ( with an . 
equal fwrftnefs y) the Water, having once attained an equal 
■Impetus thereunto , would ftill hold equal pace with it ; there 
being no oecafion , from the Quickening or Slackening of the 
Earths motion, (in that part where the Water lyeth) for the 
Water thereon either to be Caft Forward or fall Backward, and 
thereby to accumulate on the other parts of the Water : But 
the true motion of each part of the Earths furface being-com- 
pounded of thofe two motions , the Annual and Diurnal ; 
Afmudl in B J feC being, as GaiiU# there fuppofetb, about three 
times as faft as a diurnal motion in a great Circle, as D EF.$ ) 
while a Point in the Earths furface moves about its Center fh 
from G. to D. and E. and at the fame time, its Center B. be cam 
ried forwards to C ; the true motion of that Point forwards, is 
made up of both thofe motions ; to wit,of B to C, and of G to 
E ; but while G moves by D to E, E moves backward by F. 
to G, contrary to the motion of B to C ; fo that the true moti- 
on of E 3 is but the difference of B C, and EG: ( for, be fide... 
the motion of B, the Center G is alfo put forward as much as 
from G to E ; and E put backward as much as from E to G : ) 
fb that theDiurnal motion, in that part of theEarth, which is nest 
the Sun, as E F G, doth abate the progrefs of the AnnmpCand 
moft of all at F s ) and in the other part, which is from the Sou, 
as G D E,it dothincreafe it, ( and moft of all at D.) that is, in the 
day time there is.abated,in the night time is added to the Annual 
motion, about as much as is G E, the Earths Diameter. Which 
would afford us a Caufeof two Tides in twenty four hours ; the 
One upon the greateft Acceleration of motion, the Other up- 
on its greateft Retardation, \ 
And thus far GAilceQ s Difcourfe holds : ^el! enough y But then 
m , 
