A Londres (London): 1780. 12mo, 12.5 cm.  , 314, [2, blank] pp + rontispiece and two other illustrations. Bound in contemporary mottled calf, spine decorated in gilt with label, marbled endpapers, all edges gilt. Spine rubbed, with much of the label chipped away, chips to spine tips; small corner of rear free endpaper torn away; else a VG copy, internally clean and unworn. First published Paris & Laussane, 1767, this edition may be the first to bear a spurious London imprint (there were several French editions bearing the false imprint, with the first edition actually printed in London issued probably in 1796). A philosophical novel arranged as a series on conversations, it advocates (in chapter 15) religious tolerance, which caused it to be banned by the Sorbonne and accounts for the editions with the phony London imprint.