Part 53

Loeb, J., 289, 291, 302.

Logarithms, 195, 219; in music, 103-104.

Logical root, of the principle of energy, 181; of the principle of excluded perpetual motion, 182.

Lombroso, 280.

Lucian, 347.

Macula acustica, 272.

Magic lantern, 96.

Magic powers of nature, 189.

Magical power of science, belief in the, 189.

Magnet, a, 220; will compared to the pressure of a, 14; coercive force of a, 216.

Magnetic needle, near a current, 207.

Magnetised bar of steel, 242-243.

Major and minor keys in music, 100 et seq.

Malus, 242.

Man, a fragment of nature's life, 49; his life embraces others, 234.

Mann, 364.

Manuscript in a mirror, 93.

Maple syrup, statues of, on Moon, 4.

Marx, 35.

Material, the relations of work with heat and the consumption of, 245 et seq.

Mathematical methods, their character, 197-198.

Mathematics, economy of, 195; on instruction in, 338-374; C. G. J. Jacobi on, 280.

Matter, constancy of, 203; its nature, 203; the notion of, 213.

Maupertuis, his Latin city, 338.

Maximal and minimal problems, their rôle in physics, 14, footnote.

Mayer, J. R., his conception of energy, 245, 246; his methods of thought, 247; on the conservation of energy, 163, 164, 165, 167, 183, 184; his metaphysical utterances, 183, 246; also 138, 184, 191, 217, 271, 274.

Measurement, definition of, 206.

Measures, international, 108.