This lecture discusses the ancient Greek philosopher Aristotle' work, the Categories, focusing on his discussion in chapter 5 of the relationship between substances and contraries.  Substances - whether primary or secondary - do not have contraries themselves, and do not admit of degrees.  Substances do, however, admit of or accept contraries - and this is something distinctive to substances as opposed to other things.

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Aristotle, Categories - Contraries And Substances - Sadler's Lectures

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