title: Considering affinity: an ethereal conversation (part two of three).
abstract: In 1840 Hugh Strickland published a diagram showing the relationships of genera of birds in the kingfisher family. Three years later he applied this mapping idea to genera of birds of prey and songbirds, creating a large wall chart that he displayed to colleagues but never published. Both of his diagrams featured a scale of degrees of affinity. The meaning of taxonomic affinity was something Darwin thought about deeply. Details in the chart undermine Strickland's claim that his method was purely inductive.
authors.affiliation: Institute for the History and Philosophy of Science and Technology, University of Toronto, 550 Spadina Crescent, Toronto, ON, Canada M5S 2J9. Electronic address: polly.winsor@utoronto.ca.
authors.forename: Mary P
authors.initials: MP
authors.lastname: Winsor