Is not the heat of the warm room convey'd through the vacuum by the vibrations of a much subtiler medium than air, which after the air was drawn out remained in the vacuum? And is not this medium the same with that medium by which light is refracted and reflected and by whose vibrations light communicates heat to bodies, and is put into fits of easy reflexion and easy transmission? And do not hot bodies communicate their heat to contiguous cold ones, by the vibrations of this medium propagated from them into the cold ones? And is not this medium exceedingly more rare and subtile than the air, and exceedingly more elastick and active? And doth it not readily pervade all bodies? And is it not (by its elastick force) expanded through all the heavens?

Isaac Newton

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