Vide VitruviuiDe architectura, VII, 8, 3: "Ita non amplitudine ponderis sed genere singularum rerum gravitatem esse non est negandum." Pro editione impressa, vide Vitruvius, Marcus Pollio (1914). "7". In Alfred A. Howard. De Architectura libri decem. Herbert Langford Warren, Nelson Robinson (illus), Morris Hicky Morgan. Cantabrigiae in Re Publica Massachusettensi: Harvard University Press. p. 215
Albertus Einstein, "Über den Einfluß der Schwerkraft auf die Ausbreitung des Lichtes," Annalen der Physik 35 (1911); ad linguam Anglicam ab Anna Beck versum: "On the Influence of Gravitation on the Propagation of Light" in The collected papers of Albert Einstein. Vol. 3 : The Swiss years: writings, 1909–1911 (Princeton University Press, Princeton, NJ, 1994), et in The Principle of Relativity, (Dover, 1924), pp 99–108, W. Perrett and G. B. Jeffery translators, ISBN 0-486-60081-5; Vide etiam situm interretialem Anglice: The Genesis of General Relativity.
Secundum chartam ad Dr Bentley 25 Februarii 1693 (I B Cohen, Isaac Newton's papers and letters on natural philosophy and related documents (Cambridge, 1958), p. 302): "It is inconceivable that inanimate brute matter should, without the mediation of something else, which is not material, operate upon, and effect other matter without mutual contact, as it must be if gravitation in the sense of Epicurus be essential and inherent in it. And this is one reason why I desired you would not ascribe innate gravity to me. That gravity should be innate, inherent and essential to matter, so that one body may act upon another at a distance through a vacuum, without the mediation of anything else, by and through which their action and force may be conveyed from one to another, is to me a great absurdity, and I believe that no man who has in philosophical matters a competent faculty of thinking, can ever fall into it. Gravity must be caused by an agent acting constantly according to certain laws; but whether this agent be material or immaterial I have left to the consideration of my reader"; capta e sito interretiali.
A. Einstein, "Aether and the theory of Relativity" (University of Leyden, 1920). Anglice: "Recapitulating, we may say that according to the general theory of relativity space is endowed with physical qualities; in this sense, therefore, there exists an ether. According to the general theory of relativity space without ether is unthinkable; for in such space there not only wonld be no propagation of light, but also no possibility of existence for standards of space and time (measuring-rods and clocks), nor therefore any space-time intervals in the physical sense. But this ether may not be thought of as endowed with the quality characteristic of ponderable inedia, as consisting of parts which may be tracked through time. The idea of motion may not be applied to it."
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Vide VitruviuiDe architectura, VII, 8, 3: "Ita non amplitudine ponderis sed genere singularum rerum gravitatem esse non est negandum." Pro editione impressa, vide Vitruvius, Marcus Pollio (1914). "7". In Alfred A. Howard. De Architectura libri decem. Herbert Langford Warren, Nelson Robinson (illus), Morris Hicky Morgan. Cantabrigiae in Re Publica Massachusettensi: Harvard University Press. p. 215
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Isaacus Beekmann novum sensum de gravitationis verbo explicat anno 1618: "Secundo, ut quid significet verbum gravitare intelligatur, fingendum est corpus quod gravitare dicitur deorsum moveri, et illud in primo instanti motus considerandum est. Vis enim qua in primo instanti impellitur motus, ea est quae gravitatio vocatur, non illa quae illud in toto motu fert deorsum, quae a prima valde distincta esse potest. Dicemus igitur gravitationem esse vim qua proxima superficies corpori gravi subjecta, ab eodem premitur."
