sentences:  Sérieux was also instrumental in introducing the theories of German psychiatrist Emil Kraepelin (1856–1926) into French psychiatry.With his one-time mentor Valentin Magnan (1835–1916), he co-authored the book "Le délire chronique a evolution systématique" (1892), and in 1909 with Capgras, he published a treatise called "Les folies raisonnantes".Sérieux traveled widely throughout Europe, and created an extensive report on the state and conditions of psychiatric treatment in French, German, Swiss and Belgian mental asylums.