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are properties, such as motion, rest, number, form and magnitude, which are termed common, as they belong not to any one sense, but to all in common. Thus, there is a movement which is perceptible both by Touch and Sight. An object is said to be perceived accidentally when, for example, something white may be the Son of Diares—for the percipient is sensible of the individual accidentally, because of his being an accident of that which is perceived; and, therefore, no impression is made by that which is perceived, as a special object, upon the percipient.
The properties of bodies, which are in themselves perceptible, are, strictly speaking, peculiar properties; and to such each particular sense is naturally and essentially related.