“The theory I propose may therefore be called a theory of the Electromagnetic Field because it has to do with the space in the neighbourhood of the electric or magnetic bodies, and it may be called a Dynamical Theory, because it assumes that in the space there is matter in motion, by which the observed electromagnetic phenomena are produced.” MayMatterBodyScienceSpaceFieldsTheoryAssumingElectricProposeMagneticNeighbourhoods Book:The Scientific Papers of James Clerk Maxwell, Vol. I Source: The Scientific Papers of James Clerk Maxwell, Vol. I
“Gravity is a mutual affection between cognate bodies towards union or conjunction (similar in kind to the magnetic virtue), so that the earth attracts a stone much rather than the stone seeks the earth.” KindBodyEarthVirtueStonesUnionsAffectionMutualGravityMagneticConjunctions Author:Johannes Kepler
“If two stones were placed... near each other, and beyond the sphere of influence of a third cognate body, these stones, like two magnetic needles, would come together in the intermediate point, each approaching the other by a space proportional to the comparative mass of the other.” IfsTwoBodyTogetherSpaceInfluenceMassStonesThirdsSpheresNeedlesMagneticSphere Of Influence Author:Johannes Kepler