Part 52

Leibnitz, on harmony, 33; on international intercourse, 342, footnote.

Lessing, quotation from, 47.

Letters of the alphabet, their symmetry, 94, 97.

Level heights of work, 172-174.

Lever, a, in action, 222.

Leverrier, prediction of the planet Neptune, 29.

Leyden jar, 114.

Liberal education, a, 341 et seq., 359, 371.

Libraries, thoughts stored up in, 237.

Lichtenberg, on instruction, 276, 370.

Licius, a Chinese philosopher, 213.

Liebig, 163, 278.

Life and death, 186.

Light, history of as elucidating how theories obstruct research, 242; Huygens's and Newton's views of, 227-228; its different conceptions, 226; rectilinear propagation of, 194; rôle of, in vision, 81; spatial and temporal periodicity of, explains optical phenomena, 194; numerical velocity of, 58; where does it go to? 199; generally, 48 et seq.

Like effects in like circumstances, 199.

Likeness, 388, 391.

Lilliput, 84.

Lines, straight, their symmetry, 98; curved, their asymmetry, 98; of force, 249.

Links of thought, intermediate, 198.

Liquefaction, latent heat of, 178.

Liquid, efflux, law of, 150; equilibrium, figures of, 4 et seq.; the latter produced in open air, 7-8; their beauty and multiplicity of form, 7, 8; made permanent by melted colophonium, 7.

Liquids, forms of, 1-16; difference between, and solids, 2; their mobility and adaptiveness of form, 3; the courtiers par excellence of the natural bodies, 3; possess under certain circumstances forms of their own, 3.

Living force, 137, 184; law of the conservation of, 149.

Lloyd, observation of the conical refraction of light, 29.

Lobster, of Lake Mohrin, the, 61.

Localisation, cerebral, 210.

Locke, on language and thought, 358.

Locomotive, steam in the boiler of, 219.