Secondary quality

Definition and stakes

Portrait of William Whewell William Whewell,  History of scientific ideas (1858)

“ IN what precedes, we have shown by various considerations that we necessarily and universally assume the perception of secondary qualities to take place by means of a medium interjacent between the object and the person perceiving. Perception is affected by various peculiarities, according to the nature of the quality perceived: but in all cases a medium is equally essential to the process. ”
Source: Gutenberg

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