Part 50

Intellectual development, conditions of, 286 et seq.

Intentions, acts of nature compared to, 14-15.

Interconnexion of nature, 182.

Interdependence, of properties, 361; of the sensuous elements of the world, 179.

Interference experiments with the head-wave of moving projectiles, 327-328.

International intercourse, established by Latin, 341.

International measures, 108.

Invention, discovery and, distinction between, 269.

Inventions, requisites for the development of, 266, 268 et seq.

Iron-filings, 220, 243.

Italian art, 234.

Jacobi, C. G. J., on mathematics, 280.

James, W., 275, 299.

Java, 163.

Jews and Christians, monotheism of the, 187.

Jolly, Professor von, 112, 274.

Joule, J. P., on the conservation of energy, 163-165, 167, 183; his conception of energy, 245; his metaphysics, 183, 246; his method of thought, 247; also 137, 138.

Journée, 317.

Judge, criminal, the natural philosopher compared to a, 48.

Judgment, essentially economy of thought, 201-202; sharpened by languages and sciences, 357-358; also 232-233, 238.

Juliet, Romeo and, 87.

Jupiter, its satellites employed in the determination of the velocity of light, 51 et seq.

Jurisprudence, Latin and Greek unnecessary for the study of, 346, footnote.

Kant, his hypothesis of the origin of the planetary system, 5; his Critique of Pure Reason, 188; on innate concepts of the understanding, 199; on time, 204; also footnote, 93.

Kepler, 187, 270.

Kinetic energy, 177.

Kirchhoff, his epistemological ideas, 257-258; his definition of mechanics, 236, 258, 271, 273.

Knight, 289.