extremely fragmentary.  We know, however, that Casanova at last succeeded
in obtaining his pardon from the authorities of the Republic, and he
returned to Venice, where he exercised the honourable office of secret
agent of the State Inquisitors--in plain language, he became a spy.  It
seems that the Knight of the Golden Spur made a rather indifferent
"agent;" not surely, as a French writer suggests, because the dirty work
was too dirty for his fingers, but probably because he was getting old
and stupid and out-of-date, and failed to keep in touch with new forms of
turpitude.  He left Venice again and paid a visit to Vienna, saw beloved
Paris once more, and there met Count Wallenstein, or Waldstein.  The
conversation turned on magic and the occult sciences, in, which Casanova
was an adept, as the reader of the Memoirs will remember, and the count
took a fancy to the charlatan.  In short Casanova became librarian at the
count's Castle of Dux, near Teplitz, and there he spent the fourteen
remaining years of his life. 

As the Prince de Ligne (from whose Memoirs we learn these particulars)
remarks, Casanova's life had been a stormy and adventurous one, and it
might have been expected that he would have found his patron's library a
pleasant refuge after so many toils and travels.  But the man carried