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It is not the case that Post-Lockean scientific essentialism (Kripke, Putnam) holds that natural kind terms rigidly designate real essences discoverable through empirical inquiry.
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1.
Essences posited by science (e.g., DNA) are theory-laden constructs, not theory-independent discoveries about nature itself.
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2.
Many natural kind boundaries depend on pragmatic human interests rather than objective metaphysical divisions in nature.
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3.
Rigid designation can explain reference without requiring that essences exist independently of our conceptual frameworks.
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Reasons Against
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Reason against
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1.
Water turned out to be H2O despite appearing colorless and tasteless, showing empirical inquiry reveals hidden essences.
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2.
Natural kind terms like 'gold' and 'tiger' pick out the same entities across possible worlds, indicating rigid designation.
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3.
Scientific progress depends on discovering real properties that explain observable phenomena, not mere linguistic conventions.
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