O.
Objection (Enstasis), [202]; response to false, in Dialectic, [366].
[Ontology], starts from classification of Entia, [59], [61]; Science of Ens quatenus Ens, how named by Aristotle, [59]; opposed as the universal science to particular sciences, not to Phenomenology, [59]; blended with Logic in the Categories, [62]; logical aspect of, as set forth by Aristotle, [127]; of Aristotle’s predecessors, [97], [108], [551] seq.; has Dialectic as a tentative companion, [273]; not clearly distinguished from Logic and Physics by Aristotle, [422]; highest of Theoretical Sciences, subject of, [423], [593]; treats of Ens in two senses specially, [424], [425]; also critically examines highest generalities of Demonstration, [425], [579]; Aristotle’s advance in, upon Plato, [445], [561]; an objective science, [579].
Opinion, opposed to Science, in Plato, [207]; in Aristotle, [207], [236], [573]; wanting to animals, [475].
Opposita, four modes of, [104]; included under, rather than including, Relativa, [104]; should be called Opposite-Relativa, [105].
Opposition, Contradictory and Contrary, [111]; squares of, Scholastic and Aristotelian, [137 n.]
Oppositis, Treatise de, by Aristotle, lost, [134].
Organon, The, meaning of, as applied to Aristotle’s logical treatises, [55]; what it includes, [56]; not so specified by Aristotle, [56]; Aristotle’s point of view throughout, [578].
Organa, or Helps to command of syllogisms in dialectical debate, [278]; use of the, [282]; relation of the, to the Loci, [283].
Ὅρος, Term, applied both to subject and to Predicate in Analytica, [141].