“How does it come about that we have been able to find satisfactory hypotheses to explain electricity and magnetism, light and heat, in short all other physical phenomena, but have been unsuccessful in the case of gravitation?”
Kosmos (1932), Above is Beginning Quote of the Last Chapter: Relativity and Modern Theories of the Universe -->
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Willem de Sitter 44
Dutch cosmologist 1872–1934Related quotes

Source: A Manual of the Steam Engine and Other Prime Movers (1859), p. 31
Context: Hypothesis Of Molecular Vortices. In thermodynamics as well as in other branches of molecular physics, the laws of phenomena have to a certain extent been anticipated, and their investigation facilitated, by the aid of hypotheses as to occult molecular structures and motions with which such phenomena are assumed to be connected. The hypothesis which has answered that purpose in the case of thermodynamics, is called that of "molecular vortices," or otherwise, the "centrifugal theory of elasticity. (On this subject, see the Edinburgh Philosophical Journal, 1849; Edinburgh Transactions, vol. xx.; and Philosophical Magazine, passim, especially for December, 1851, and November and December, 1855.)

Preface
A Course of Lectures on Natural Philosophy and the Mechanical Arts (1807)

Kosmos (1932), Above is Beginning Quote of the Last Chapter: Relativity and Modern Theories of the Universe -->

p, 125
The Structure of the Universe: An Introduction to Cosmology (1949)

Source: A Manual of the Steam Engine and Other Prime Movers (1859), p. 31

volume III, chapter I: "The Spread of Evolution", page 18 http://darwin-online.org.uk/content/frameset?pageseq=30&itemID=F1452.3&viewtype=image; letter to Joseph Hooker (1871)
The Life and Letters of Charles Darwin (1887)

[Of Atoms, Mountains, and Stars: A Study in Qualitative Physics, Victor F. Weisskopf, Science, 187, 4177, 21 February 1975, 605–612, http://www.jstor.org/stable/1739660]
Source: Mathematical Thought from Ancient to Modern Times (1972), p. 442.