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QUANTITY and QUALITY are two forms of thinking, considered to be among the original ideas of the human understanding, or categories. (See Kant) Qualities are the interior properties of an object, which are observable in it, without comparison with other objects. By quantity, however, we understand that property of an object by which it can be increased and diminished, and estimated according to a given measure. Quantity, in connexion with time, produces the idea of number, inasmuch as we represent to our mind a successive repetition of unities. In logic, the ideas of quality and quantity are of great importance, and are treated with much acuteness by Kant.