Considering affinity: an ethereal conversation (part two of three)

Area of Science:

• Ornithology
• Taxonomy
• History of Science

Background:

• Hugh Strickland, a notable ornithologist, developed early graphical representations of avian taxonomic relationships.
• Strickland's work predates later evolutionary synthesis, offering insight into pre-Darwinian classification methods.

Purpose of the Study:

• To analyze the methodology and implications of Hugh Strickland's unpublished bird classification charts.
• To evaluate Strickland's claim of an inductive approach in his taxonomic mapping.

Main Methods:

• Examination of Strickland's 1840 published diagram of kingfisher family relationships.
• Analysis of Strickland's unpublished 1843 wall chart depicting birds of prey and songbirds.
• Assessment of the 'scale of degrees of affinity' used in both diagrams.

Main Results:

• Strickland's diagrams visualized taxonomic relationships using a quantitative scale.
• The unpublished 1843 chart, though not formally published, provides substantial data on Strickland's classification ideas.
• Specific details within the 1843 chart suggest elements beyond a purely inductive methodology.

Conclusions:

• Strickland's diagrams represent significant early attempts at visualizing complex taxonomic data.
• The analysis challenges the assertion that Strickland's classification method was exclusively inductive.
• These findings contribute to understanding the historical development of phylogenetic thinking in ornithology.