among metaphysicians, is taken in various senses. Sometimes it signifies a thing's not be- longing to the essence of another; in which sense the efficient cause and end of a thing are said to be extrin- sic. Sometimes it signifies a thing's not being contained within the capacity of another; in which sense, those causes are called extrinsic which introduce something into a subject from without, as when a fire introduces heat. Sometimes it signifies a thing added or applied to another; in which sense accidents and adherents are said to be extrinsic to the subjects to which they adhere. Sometimes the vision is said to be extrinsic from some form which does not exist in that thing, but is adjacent to it, or by some means or other with- out it.