EnglishGeneralLibrary Science

Five Predicable of Library Classification

Five Predicable of Library Classification: A series of logical terms and notations, first explained by Porphyry in his treatise on Aristotle’s Topics, and forming the basis of the science of classification. They are:

  1. Genus,
  2. Species,
  3. Difference,
  4. Property,
  5. Accident,
1. Genus: A main class, or group of things, which may be divided into sub-groups called Genus.
For examples:
2. Species: The groups into which the genus is divided. Each group may itself become a Genus subject to farther division.
3. Difference: A characteristic or quality which enables a genus to be divided, e.g. add to the genus ‘books’ the difference ‘method of production’ and the species ‘MS. Books’, and ‘printed books’ result.
4. Property: A quality possessed by every member of genus but which is not confined to that genus. Though not essential to definition of that genus, the position of a property is inherent in the nature of a spaces.
5. Accident: A quality which incidental to a class, which may or may not belong to it, and which has no effect on the other qualities of the class.

Reference: Harrods Librarian Glossary 10th edition.

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