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In particular, his Differential Equations and the Calculus of Finite Differences (1839) incorporated the new solution of the Laplacian equation for the figure of the earth as given by Thomas Gaskin in symbolic form; it was the elaboration of this original solution by Robert Leslie Ellis in 1841 which led largely to George Boole's masterpiece On a general method in analysis in 1844 (PRS, 5, 1843–50).