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Ideas for 'fragments/reports', 'Metaphysical Themes 1274-1671' and 'Ideas, Qualities and Corpuscles'

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2 ideas

14. Science / D. Explanation / 2. Types of Explanation / k. Explanations by essence
Can the qualities of a body be split into two groups, where the smaller explains the larger? [Alexander,P]
     Full Idea: Is there any way of separating the qualities that bodies appear to have into two groups, one as small as possible and the other as large as possible, such that the smaller group can plausibly be used to explain the larger?
     From: Peter Alexander (Ideas, Qualities and Corpuscles [1985], 5.02)
     A reaction: Alexander implies that this is a question Locke asked himself. This is pretty close to what I take to be the main question for essentialism, though I am cautious about couching it in terms of groups of qualities. I think this was Aristotle's question.
Essences must explain, so we can infer them causally from the accidents [Pasnau]
     Full Idea: Without the explanatory role of essence, the underlying epistemic picture would be jeopardised, because there would no longer be any causal route by which we might get from accidents to essence.
     From: Robert Pasnau (Metaphysical Themes 1274-1671 [2011], 27.5)
     A reaction: There is a slight whiff of circularity here. It could be that we are psychologically desperate for essences, and so we invent bogus causal routes from the accidents to get at them. Can we know there are essences awaiting us, on independent grounds?