Book excerpt: The letters in this volume continue to cover Ricardo's correspondence while a member of the House of Commons and provide subtle refinements and elaborations to his political economic thoughts. This volume includes a complete index to volumes 6 through 9, which contain Ricardo's correspondence. The index is cross-referenced by name and topic. Ricardo's letters remain a permanent legacy to the development of his many contributions to the political economy and a record of his endearing friendships.The entire series includes: Volume 1 "On the Principles of Political Economy and Taxation"Volume 2 "Notes on Malthus's Principles of Political Economy"Volume 3 "Pamphlets and Papers 1809-1811 "Volume 4 "Pamphlets and Papers 1815-1823"Volume 5 "Speeches and Evidence"Volume 6 "Letters 1810-1815"Volume 7 "Letters 1816-1818"Volume 8 "Letters 1819-1821"Volume 9 "Letters 1821-1823"Volume 10 "Biographical Miscellany"Volume 11 "General Index"