[Addition to the Preface in the Sixth, Edition, 1865]

The present, like all previous editions, has been revised throughout, and additional explanations, or answers to new objections, have been inserted where they seemed necessary; but not, in Edition: current; Page: [xxxi] general, to any considerable length. The chapter in which the greatest addition has been made is that on the Rate of Interest; and for most of the new matter there introduced, as well as for many minor improvements, I am indebted to the suggestions and criticisms of my friend Professor Cairnes, one of the most scientific of living political economists.