Laboulaye's comments on Franklin, 38.
Laplace's theory of Saturn's rings, 285.
Latent heat, Black's theory of, 144;
Cavendish's views on, 144.
Leonardo da Vinci's observation of capillary attraction, 228.
Leyden jar, discovery of, 4;
energy of, resident in the glass, 79.
Leyden jars charged by cascade, 77.
Light, Franklin's view of nature of, 86;
Maxwell's electro-magnetic theory of, 306;
rotation of the plane of polarization of, 273.
Lightning, effects of, on Newbury steeple, 92.
Lightning-protectors, Maxwell's, 294.
Lightning-rod, illustrations of the, 83.
_Lignum nephriticum_, dichroism of, 30.
Lines of force mathematically investigated by Thomson and Maxwell,
300.
Lines of magnetic force fixed by Faraday, 269.
Luminiferous ether, the vehicle of electrical action, 227;
illustration of the possible constitution of, 302.