Between 1910 and 1929 he wrote several papers on his version of a kinetic theory of gravitation, based on some sort of electromagnetic waves.
He is known for his works (1875–1894) on the kinetic theory of gases and his attempts to combine this theory with Le Sage's theory of gravitation.
Van Flandern supported Le Sage's discredited theory of gravitation, according to which gravity is the result of a flux of invisible "ultra-mundane corpuscles" impinging on all objects from all directions at superluminal speeds.
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Born in Clifton, Bristol, Le Sage was the son of John Sage and his wife Elizabeth, née Godfrey; Le Sage would adopt the "Le" for his last name during middle age.
A book written by a pupil of his, Amadou Hampate Ba, titled Vie et enseignement de Tierno Bokar: Le sage de Bandiagara (translated into English under “A Spirit of Tolerance: The Inspiring Life of Tierno Bokar”) introduced him to the non-African world.