Apply four questions to any case:
1. Is the term universal or an individual name?
2. Of which things is it given in reply to “What is it?”
3. Do those things agree or differ in specific essence?
4. Does the term also stand below a broader genus, making it a relative species?
Animal, relative to human and horse: genus.
Human, relative to Zayd and Amr: real species.
Animal, relative to growing body: relative species.
The classification changes when the relation under examination changes.
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The Five Predicables: Genus, Species and Hierarchy of Genera
Apply four questions to any case:
1. Is the term universal or an individual name?
2. Of which things is it given in reply to “What is it?”
3. Do those things agree or differ in specific essence?
4. Does the term also stand below a broader genus, making it a relative species?
Animal, relative to human and horse: genus.
Human, relative to Zayd and Amr: real species.
Animal, relative to growing body: relative species.
The classification changes when the relation under examination changes.