 Audubon funded the costly printing project through a pay-as-you-go subscription.From 1826 to 1829, he travelled around the UK and to Paris, lecturing on ornithology and frontier American life in an effort to entice wealthy patrons to subscribe to the series of prints.Subscribers included the French king Charles X, the British queen Adelaide of Saxe-Meiningen, Lord Spencer, and, later, the Americans Daniel Webster and Henry Clay.