_For the portrait at the beginning of the book the author is obliged to
the present Marquis d'Argenson. He is pleased to have this opportunity
of thanking Mr. H. L. Samuel, of Balliol College, and also Mr. T. A.
Vans Best and Mr. F .S. P. Swann, of Magdalen, for invaluable advice
and help._
_APPENDICES._