for a form of logical division, consisting in the separation of a genus into two species, one of which has and the other has not, a certain quality or attribute. Thus men may be thus divided into
; each of these may be subdivided similarly. On the principle of contradiction this division is both exhaustive and exclusive; there can be no overlapping, and no members of the
, though formally accurate, has slight value in the exact sciences, partly because at every step one of the two groups is merely negatively characterized and therefore incapable of real subdivision; it is 'useful, however, in setting forth clearly the
descent from the most inclusive genus (summum genus) through species to the lowest class (infima species), which is divisible only into individual persons or things. (See further DIVISION.) In astronomy the
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