1 The study of family history; see Nash (2002) Env. & Plan. D 20 (1) 27, who observes that ‘genealogy can serve to anchor and protect exclusive national cultures’.
2 The history of systems of thought; the history of those structures within society that ‘have produced and shaped the boundaries of knowledge, ideas, truths, representations, and discursive formations in different historical periods’ (Crowley in R. Kitchin and N. Thrift 2009). S. Aitken and G. Valentine (2006), p.15 throw light on this concept: in geography ‘professional organizations may privilege or reinforce particular fashionable ways of thinking, but there are always dissenting voices. In reality, most ways of knowing are partial or in flux’.