She wrote seven novels , Adam Bede ( 1859 ) , The Mill on the Floss ( 1860 ) , Silas Marner ( 1861 ) , Romola ( 1862-63 ) , Felix Holt , the Radical ( 1866 ) , Middlemarch ( 1871-72 ) and Daniel Deronda ( 1876 ) , most of which are set in provincial England and known for their realism and psychological insight .