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Primary and Secondary QualitiesThe Historical and Ongoing Debate$
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Lawrence Nolan

Print publication date: 2011

Print ISBN-13: 9780199556151

Published to Oxford Scholarship Online: May 2011

DOI: 10.1093/acprof:oso/9780199556151.001.0001

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PRINTED FROM OXFORD SCHOLARSHIP ONLINE (oxford.universitypressscholarship.com). (c) Copyright Oxford University Press, 2021. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in OSO for personal use. date: 05 March 2021

Kant and Helmholtz on Primary and Secondary Qualities

Kant and Helmholtz on Primary and Secondary Qualities

(p.304) 12 Kant and Helmholtz on Primary and Secondary Qualities
Primary and Secondary Qualities

Gary Hatfield

Oxford University Press

This chapter finds two versions of the distinction between primary and secondary qualities in Galileo, Descartes, Boyle, and Locke. Although agreeing that primary qualities are physically basic properties of extended particles (including size, shape, position, and motion), these authors differed on whether secondary qualities such as color exist only in the mind as sensations or belong to bodies as powers to cause sensations. Kant was initially a metaphysical realist about primary qualities as spatialized forces (vs bare extended particles), before placing space among the appearances in his critical period. Space becomes the subjective form in which transcendently real forces and relations appear. Kant viewed color as a subjective sensation in the mind, whereas Helmholtz treated color as a power to cause sensations. Helmholtz was initially a realist about primary qualities as spatialized masses and forces, but he later adopted the epistemically modest view of space as the subjective form in which forces and relations appear.

Keywords:   appearances, corpuscularianism, Descartes, Galileo, Helmholtz, Kant, Locke, Newton, phenomena, primary qualities, realism, secondary qualities

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