Jean-Baptiste SAY (1767–1832). 4 letters, Paris, 1817–1826, to the bookseller Jean-François Déterville; 5 pages, in-8 and in-4 formats, 3 addresses. To the publisher of his *Treatise on Political Economy*. January 18, 1817: *Le Censeur* is about to be republished; and Comte & Dunoyer are ready to write a favorable review of the 3rd edition; he therefore asks Déterville to send them copies. – June 23, 1819, regarding the fourth edition: Say protests against the tyranny of his publisher, who “relies a little too much on the selflessness of authors”; he agrees to 3,200 copies and will take care of the 5 copies for the Library Administration, but refuses to change the terms of payment. – April 9, 1825: He requests three more copies and two dozen for next week. – April 8, 1826, regarding his fifth edition: he has received proposals “that offer me slightly more advantages, and which, by placing sales in the Stock Exchange district and among the high-end trade, will, I believe, make them faster. I have accepted them and, out of courtesy, felt obliged to inform you.” This edition will not be published until the remaining copies of the fourth edition have been sold out…