 At the conclusion of their 9-month study, they returned to France, and he and Tocqueville published their great political analysis "Du système pénitentiare aux Etats-Unis, et de son application en France" (two volumes, 1833).When the first edition was published, Beaumont, sympathetic to social injustice, was working on another book, "Marie, ou l'esclavage aux Etats-Unis" (two volumes, 1835), which was a social critique and novel describing the separation of races in a moral society and the conditions of slaves in America.Although the 1833 writing was successful, Tocqueville was given intellectual recognition, which was not the case with Beaumont.