French mathematician, musician, and philosopher (1717-1783). Autograph letter signed ("d'alembert"). Paris. 4to. 2½ pp. on bifolium with integral address panel. In French.
$ 3,833 / 3.500 €
To the playwright Charles-Louis de Portelance, in his castle of Thoury near the Château-Landon, where Portelance appears to be embroiled in political difficulties. Best known for his mathematical discoveries and as co-editor with Diderot of the "Encyclopédie", d'Alembert here shows his political side. He is, however, forced to deliver bad news: he was finally able to see the Spanish ambassador, but the ambassador had no place to offer "notre jeune homme", who would "ne trouverois rien à faire en Espagne".