This MS was probably taken to St Petersburg by Wagnière in the summer of 1779 along with the rest of Voltaire’s library.
Bibliography
Bibliography:
Fernand Caussy, Inventaire des manuscrits de la bibliothèque de Voltaire conservée à la bibliothèque impériale publique de Saint-Pétersbourg (Geneva, Slatkine reprints, 1970), p.38.