 Having left Paris on 6 September 1844, Engels returned to his home in Barmen, Germany, to work on his "The Condition of the Working Class in England", which was published in late May 1845.Even before the publication of his book, Engels moved to Brussels in late April 1845, to collaborate with Marx on another book, "German Ideology".While living in Barmen, Engels began making contact with Socialists in the Rhineland to raise money for Marx's publication efforts in Brussels.