This manuscript, in its original state, has never been printed. Herr Brockhaus, on obtaining possession of the manuscript, had it translated into German by Wilhelm Schutz, but with many omissions and alterations, and published this translation, volume by volume, from 1822 to 1828, under the title, 'Aus den Memoiren des Venetianers Jacob Casanova de Seingalt.' While the German edition was in course of publication, Herr Brockhaus employed a certain Jean Laforgue, a professor of the French language at Dresden, to revise the original manuscript, correcting Casanova's vigorous, but at times incorrect, and often somewhat Italian, French according to his own notions of elegant writing, suppressing passages which seemed too free-spoken from the point of view of morals and of politics, and altering the names of some of the persons referred to, or replacing those names by initials. This revised text was published in twelve volumes, the first two in 1826, the third and fourth in 1828, the fifth to the eighth in 1832, and the ninth to the twelfth in 1837; the first four bearing the imprint of Brockhaus at Leipzig and Ponthieu et Cie at Paris; the next four the imprint of Heideloff et Campe at Paris; and the last four nothing but 'A Bruxelles.' The volumes are all uniform, and were all really printed for the firm of Brockhaus. This, however far from representing the real text, is the only authoritative edition, and my references throughout this article will always be to this edition.
In turning over the manuscript at Leipzig, I read some of the suppressed passages, and regretted their suppression; but Herr Brockhaus, the present head of the firm, assured me that they are not really very considerable in number. The damage, however, to the vivacity of the whole narrative, by the persistent alterations of M. Laforgue, is incalculable. I compared many passages, and found scarcely three consecutive sentences untouched. Herr Brockhaus (whose courtesy I cannot sufficiently acknowledge) was kind enough to have a passage copied out for me, which I afterwards read over, and checked word by word. In this passage Casanova says, for instance: 'Elle venoit presque tous les jours lui faire une belle visite.' This is altered into: 'Cependant chaque jour Therese venait lui faire une visite.' Casanova says that some one 'avoit, comme de raison, forme le projet d'allier Dieu avec le diable.' This is made to read: 'Qui, comme de raison, avait saintement forme le projet d'allier les interets du ciel aux oeuvres de ce monde.' Casanova tells us that Therese would not commit a mortal sin 'pour devenir reine du monde;' pour une couronne,' corrects the indefatigable Laforgue. 'Il ne savoit que lui dire' becomes 'Dans cet etat de perplexite;' and so forth. It must, therefore, be realized that the Memoirs, as we have them, are only a kind of pale tracing of the vivid colours of the original.
When Casanova's Memoirs were first published, doubts were expressed as to their authenticity, first by Ugo Foscolo (in the Westminster Review, 1827), then by Querard, supposed to be an authority in regard to anonymous and pseudonymous writings, finally by Paul Lacroix, 'le bibliophile Jacob', who suggested, or rather expressed his 'certainty,' that the real author of the Memoirs was Stendhal, whose 'mind, character, ideas and style' he seemed to recognise on every page. This theory, as foolish and as unsupported as the Baconian theory of Shakespeare, has been carelessly accepted, or at all events accepted as possible, by many good scholars who have never taken the trouble to look into the matter for themselves. It was finally disproved by a series of articles of Armand Baschet, entitled 'Preuves curieuses de l'authenticite des Memoires de Jacques Casanova de Seingalt,' in 'Le Livre,' January, February, April and May, 1881; and these proofs were further corroborated by two articles of Alessandro d'Ancona, entitled 'Un Avventuriere del Secolo XVIII., in the 'Nuovo Antologia,' February 1 and August 1, 1882. Baschet had never himself seen the manuscript of the Memoirs, but he had learnt all the facts about it from Messrs. Brockhaus, and he had himself examined the numerous papers relating to Casanova in the Venetian archives. A similar examination was made at the Frari at about the same time by the Abbe Fulin; and I myself, in 1894, not knowing at the time that the discovery had been already made, made it over again for myself. There the arrest of Casanova, his imprisonment in the Piombi, the exact date of his escape, the name of the monk who accompanied him, are all authenticated by documents contained in the 'riferte' of the Inquisition of State; there are the bills for the repairs of the roof and walls of the cell from which he escaped; there are the reports of the spies on whose information he was arrested, for his too dangerous free-spokenness in matters of religion and morality. The same archives contain forty-eight letters of Casanova to the Inquisitors of State, dating from 1763 to 1782, among the Riferte dei Confidenti, or reports of secret agents; the earliest asking permission to return to Venice, the rest giving information in regard to the immoralities of the city, after his return there; all in the same handwriting as the Memoirs. Further proof could scarcely be needed, but Baschet has done more than prove the authenticity, he has proved the extraordinary veracity, of the Memoirs. F. W. Barthold, in 'Die Geschichtlichen Personlichkeiten in J. Casanova's Memoiren,' 2 vols., 1846, had already examined about a hundred of Casanova's allusions to well known people, showing the perfect exactitude of all but six or seven, and out of these six or seven inexactitudes ascribing only a single one to the author's intention. Baschet and d'Ancona both carry on what Barthold had begun; other investigators, in France, Italy and Germany, have followed them; and two things are now certain, first, that Casanova himself wrote the Memoirs published under his name, though not textually in the precise form in which we have them; and, second, that as their veracity becomes more and more evident as they are confronted with more and more independent witnesses, it is only fair to suppose that they are equally truthful where the facts are such as could only have been known to Casanova himself.