y's refutation of, 275 ff.;
in Plato and Aristotle, 334.

MECHANICAL THEORY, practical significance of its extension to the
world at large, 20;
in cosmology, 161, 225;
of Descartes, 231;
of Newton 232;
of origin of cosmos, 242;
of life, 244;
in Spinoza, 336.

METAPHYSICS, relation to epistemology, 150;
relation to ethics, 151, 196 ff.;
definition of, 158;
relation to logic, 188;
relation to theology, 207;
present tendencies in, 399 ff., 408.

MILL, J. S., 283 (_note_).

MIND, explanation of in naturalism, 237, 247 ff.;
of God, in Berkeley, 284, 294, 296;
absolute, 349 (_note_), 358, 382 ff.
Also see under SELF, and SOUL.

MODE, in Spinoza, 313.

MONADS, in Leibniz, 338.

MONISM, 159, 163.

MORALITY, and religion, 73;
grounds of, according to Kant, 356;
incentive to, 422.

MYSTICISM, general account, 171;
Schopenhauer's, 290;
types of religions, 391.

NAEGELI, C. v., quoted, 287.

NATURAL SCIENCE, true relations of, with philosophy, 116;
sphere of, with reference to philosophy, 117 ff.;
philosophy of, its procedure, 121, 135, 142, 154, 401;
origin of, as special interest, 123 ff.;
human value of, 126, 127, 143;
method and fundamental conceptions of, 406, 128 ff.;
general development of, 134;
limits of, because abstract, 136 ff., 414;
validity of, 142;
logic and, 188;
development of conceptions in, 229 ff.;
grounds of, according to Kant, 355, 377;
Hume on, 377;
permanence and progress in, 395 ff.

NATURAL SELECTION, 204, 245.

NATURALISM, chap. viii;
general meaning, 217, 223 (_note_), 399;
claims of, 239;
task of, 241;
criticism of, 117, 257, 263;
of present day, 405, 412.
Also see under MATERIALISM, and POSITIVISM.

NATURE, 160, 244, 337;
in Berkeley, 294;
in Spinoza, 317, 338;
in Hegel, 363;
in Kant, 377 ff.;
in contemporary philosophy, 401.
Also see NATURAL SCIENCE, and NATURALISM.

NEBULAR HYPOTHESIS, 242.

NECESSITY, of will, 211;
ethics of, 342;
religion of, 393.

NEO-FICHTEANS, 402, 403 (_note_).

NEO-KANTIANS, 403.

NEWTON, 232, 235, 242, 355, 377.

NORMATIVE SCIENCES, the, 180.

OMAR KHAYYAM, quoted, 16;
as a philosopher-poet, 36.

ONTOLOGICAL PROOF, of God, 200.

ONTOLOGY, 159.

OPTIMISM, 104, 388, 422, 424.