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concave Sphere «.nay move with another included in it^ 
having the fame common Centre. Nor can it well be 
fuppofed otherwife, confidering the Nature of Gravity, 
for fliould thefe Globes be ad jutted once to the fame 
common Centre, the Gravity of the parts of the Con* 
cave would prefs equally towards the Centre of the in- 
ner Ball, which Equality muft neceffarily continue till 
fome external force difturb it, which is not eafie to ima- 
gine in our cafe. This perhaps I might more intelligi- 
bly exprefs, by faying that the inner Globe being pofi- 
ted in the Centre of the exterior, muft neceffarily a- 
fcend which way foever it move 3 that is, it muft over- 
come the force of Gravity preffing towards the common 
Centre, by an impulfe it muft receive from fome out- 
ward Agent 5 but all outward efforts being fufficiently 
fenced againft by the Shell that furround sit, it follows, 
that this Nucleus being oncefixt in the common Centre, 
muft always there remain. 
As to the leaking of the Water through this 
Shell, when once a paflfage (hall be found for it to run 
through, I muft confefsit is an Obje&ion feemingly of 
weight 5 but when we confider how tightly great Beds 
^f Chalk or Clay, and much more Stone do hold water, 
and even Caves arch'd with Sand 3 no man can doubt 
but the Wifdom of the Creator has provided for the 
Macrocofm by many more ways than I can either ima- 
gine or exprefs, efpecially fincewe fee the admirable 
and innumerable Contrivances wherewith each worth- 
left Individual is furnilht both to defend it felf and pro- 
pagate its 'Species. What Curiofity in the Stru&ure, 
what Accuracy in the Mixture and Compofition of the 
parts ought not we to expedt in the Fabrick of this 
Globe, made to be the lafting Habitation of fo many 
various Species of Animals, in each of which there 
want not many Inftances that rpanifeft the boundlefs 
Power and Goodnefs of -their Divine Author 5 and can 
R. z we 
