Trait? th?orique et pratique de droit civil. De la vente et de l'?change This book, "De la vente et de l'?change", by Gabriel Baudry-Lacantinerie, Leo Saignat, is a replication of a book originally published before 1908. It has been restored by human beings, page by page, so that you may enjoy it in a form as close to the original as possible.