N.

National Character, a complex result, 17; conjoint effect of moral and physical influences, 17; human freedom not to be disregarded in the study of, 20; influence of geographical surroundings, 23--of climate and natural scenery, on the pursuits and mental character of nations, 23--on creative art, 24--and literature of nations, 25.

Nations, individuality of, 22; determined mainly from without, 22.

Natural Realism, 305; Anaxagoras a natural realist, 311-313.

Nature, interpreted by man according to fundamental laws of his reason, 133.

O.

Obligation, the sense of, lies at the foundation of religion, 115.

Ontological proof of the existence of God, 491-493.

Ontology, of Plato, 369-379; the subject-matter of the world of sense, 370-373; the permanent substratum of mental phenomena, 373-376; the first Principle of all principles--God, 377-379, 491-493.