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of the earth, and the tides, were mathemat-
ically treated by Maclaurin, D’Alembert,
Legendre, Clairaut, Euler, Lagrange, Laplace,
Walmsley, Bailly, Lalande, Delambre, Mayer,
Hansen, Burchardt, Binet, Damoiseau, Plana,
Poisson, Gauss, Bessel, Bouvard, Airy, Ivory,
Delaunay, Le Verrier, Adams, and others of
later date.
By passing over these important devel-
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