This lecture discusses the ancient Greek philosopher Aristotle' work, the Categories, focusing on his distinction in chapter 5 of the distinction between primary and secondary substances.  Primary substances are existing individual things, which function as the underlying subjects that other things either are in or are predicated of.  Secondary substances include species and genera, and are not substances in a full sense of the term.

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Aristotle, Categories - Primary And Secondary Substances - Sadler's Lectures

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