In 1782, at Frederick the Great's invitation, he went to Berlin, where he remained for many years, in the course of which he published his Vie et régne de Frédéric II (Berlin, 1788) and La Prusse littéraire sous Frédéric II (3 vols., Berlin, 1790–1791).
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His Oración apologética por la España y su mérito literario (1786) is an excellent example of learned advocacy, far superior to similar efforts made by Carlo Denina and Antonio Cavanilles; and his posthumous Exequias de la lengua castellana (printed in the Biblioteca de autores españoles, vol. LXIII.) testifies to his scholarship and taste.