Full Idea
The place of a whole is the same as the sum of the places of the parts, and is therefore internal and in the whole body.
Gist of Idea
The place of a thing is the sum of the places of its parts
Source
Isaac Newton (Principia Mathematica [1687], Def 8 Schol)
Book Reference
Newton,Isaac: 'Philosophical Writings' [CUP 2004], p.65
A Reaction
Note that Newton is talking of the sums of places, and deriving them from the parts. This is the mereology of space.