Porphyrian tree

Porphyrian tree

An arbor porphyriana or Porphyrian tree, created by Porphyry, is a hierarchical (tree structured) ontology, construction in logic consisting of three rows or columns of words; the middlemost whereof contains the series of genus and species, and bears some analogy to the trunk. The extremes, containing the differences, are analogous to the branches of a tree. An example is

::

The arbor porphyriana has also been known as scala praedicamentalis. Until the late 19th century, it was still being taught to students of logic.

References

*1728 [http://digicoll.library.wisc.edu/cgi-bin/HistSciTech/HistSciTech-idx?type=turn&entity=HistSciTech000900240168&isize=L]
*S. Jevons (1870). "Elementary Lessons in Logic". London.


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