326 
phknqmkna of the ocean. 
nfl’* 
j rii .-V V* — 
The tides are simjile and yialpuble ^ 
motion, and all motion is caused by other tno 
2. If the earth were a true homogeneous " jb/ lff 
yered equally with water, and moved or 
cet acting equally on tl;a ends of its equatona ^ 
all its parts would move simultaneously _y ii^^iiil 
menta, and there could be no Tides. But -^0 i'' (t 
lities in the density of its masses, or any 
direction of the forces caused the centre ot gl' 
become different from the mathematical centr 
moveable waters, in their capability of ' 
themselves to the centre of gyration, wmilu 
change their position in relation to the cr'',*^ilt' 
lange uieii |)uaitiL?ii m icku-ia/h i.w ^ 
3. The earth and moon move round a comm 
fliA nv rli.stflnces bein^ ill the m' 
fulcrum, the arms or distances bein,^ ... - 
cate ratio of 'their quantities of matter^ an< ji 
fluids, in respecting this centre of motion, fisc 
fulcrum, which is^ always in the^line 
of the earth and moon; and hence the P!'‘^\lir 
the Tides, govemed in succes.sive rotations 
the Tides, govemea m succes.sive roiaiions ^ 
in which the common fulcrum, passes the 
4. The tides therefore are caused by the on'd' e 
J lie blVieo civv. v.i*v«owv. 
the earth round the fulcrum, or centre „i,le 'ffi/ 
of the earth and moon, and as the psit^ 
ot tne earui auu uiwun, ...... — - p. 
in restoring the equilibrium, accumulate 
fulcrum, they have the appearance ot being ‘ 
it i* called, by the moon. 
caneu, oy cue muon. . ^ 
The double tide in every twenty-m , 
/» .A ^ VI* ^ 
1 1* i 
I IIV/ V4WV.ky*%- . Krt til*' ’ , 
caused by the departure of ^t fulcmin /f 
the continents which separate the two grea i#;„ 
each other, wlien, ai no force retains the e ^ 
they relapse or swing back, and produce a aPfufS 
6. llie variable heights of the tides, ® ij 
connected with the age of the moon, are f 
variable distance of the body of the earth 
of its orbicular force, during its revolutm | (t 
lunar and mundane centre of motion. - 
111 A 
nar anu inuiiuane centre oi uiuviun. 
On account of the shallowness of some ® ^ 
narrowness of the straits in others, 
airersity in the phenomena, only to be iprjjf 
Kir nil exact knowledsre of the place. _ tl*^' 
by an exact knowledge of the place. ^ tl' 
in the English channel, and the German ocC' 
