As energy is essentially positive it is impossible for any part of space to have negative energy. Hence those points of space in which there is no resultant force, such as the points of equilibrium in the space between the different bodies of a system and within the substance of each body must have an intrinsic energy per unit of volume greater than 1/8[pi]R<sup>2<\sup> where R is the greatest possible value of the intensity of gravitating force in any part of the universe The assumption therefore that gravitation arises from the action of the surrounding medium in the way pointed out, leads to the conclusion that every part of this medium possesses when undisturbed an enormous intrinsic energy, and that the pressure of dense bodies influences the medium so as to diminish this energy wherever there is a resultant attraction As I am unable to understand in what way a medium can possess such properties I cannot go any further in this direction in searching for the cause of gravitation.
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J. C. Maxwell’s, ‘Dynamical theory of the electromagnetic field’, 1864. From The Royal Society, PT/72/7
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