Old Age and Death The Memoirs Of Jacques Casanova De Seingalt ...

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In July 1789 there was discovered, among the papers of the Bastille, the
letter which Casanova wrote from Augsburg in May 1767 to Prince Charles
of Courlande on the subject of fabricating gold. Carrel published this
letter at once in the third volume of his 'Memoirs authentiques et
historiques sur la Bastille'. Casanova kept a copy of this letter and
includes it in the Memoirs.
In October 1789, Casanova wrote M. Opiz that he was writing to a
professor of mathematics [M. Lagrange] at Paris, a long letter in
Italian, on the duplication of the cube, which he wished to publish. In
August 1790, Casanova published his 'Solution du Probleme Deliaque
demontree and Deux corollaires a la duplication de hexadre'. On the
subject of his pretended solution of this problem in speculative
mathematics, Casanova engaged with M. Opiz in a heated technical
discussion between the 16th September and 1st November 1790. Casanova
sought vainly to convince Opiz of the correctness of his solution.
Finally, M. Opiz, tired of the polemics, announced that he was leaving on
a six-weeks tour of inspection and that he would not be able to occupy
himself with the duplication of the cube for some time to come. On the
1st November, Casanova wished him a pleasant journey and advised him to
guard against the cold because "health is the soul of life."
In 1797, appeared the last book published during Casanova's lifetime, a
small work entitled: 'A Leonard Snetlage, docteur en droit de
l'Universite de Goettingue, Jacques Casanova, docteur en droit de
l'Universite de Padoue'. This was a careful criticism of the neologisms
introduced into French by the Revolution. In reference to Casanova's
title of "Doctor," researches by M. Favoro at the University of Padua had
failed to establish this claim, although, in the Memoirs Casanova had
written: