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LAPLACE, PIERRE SIMON. Autograph Letter Signed, "M[arqu]is de Laplace," to Antoine-François-Claude Ferrand, in French,

SIGNED ON THE DAY HIS FRIEND, THE CHEMIST BERTHOLLET, DIED LAPLACE, PIERRE SIMON. Autograph Letter Signed, "M[arqu]is de Laplace," to Antoine-François-Claude Ferrand, in French, respectfully declining an invitation because of commitments to care for his dying friend [Claude Louis] Berthollet. 1/2 page, 4to, with integral address leaf, addressed in holograph; minor loss at right edge from seal tear, faint staining at upper right, folds. Np, 6 November 1822

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