“…This principal was inferred, vis-à-vis phylogeny, in an article that I penned on schizophrenia in Mannheim. 3 The diagnostic and epidemiological findings of the author, Hafner, in no small part reflected the local conditions in Mannheim, Germany, most notably, the history of Nazism and World War II, and the history of immigration from Eastern Europe and Asia. I penned a further article and a comment that make the comparable case for ontogeny, vis-à-vis diagnosis in suicidology (see http://bjp.rcpsych.org/content/205/2/120.e-letters#suicide-ontogeny-and-phylogeny).…”