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Ideas from 'De formis' by Walter Burley [1330], by Theme Structure

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12. Knowledge Sources / B. Perception / 2. Qualities in Perception / c. Primary qualities
16719 The primary qualities are mixed to cause secondary qualities
                        Full Idea: Secondary qualities are caused by a mixture of primary qualities.
                        From: Walter Burley (De formis [1330], pars post p.65), quoted by Robert Pasnau - Metaphysical Themes 1274-1671 21.2
                        A reaction: Like paint. He probably has in mind hot, cold, wet and dry as the primary qualities.