Justinian Code, [260].

Kepler, [463].

Knowledge, diffusion of, [480].

Koch, [470].

Koran, the, [304], [310].

Labor, social economics of, [496].

Lake dwellings, [78].

Lamarck, J. P., [467].

Land, use of, determines social life, [145].

Language, origin of, [121]; a social function, [123]; development of, [126-129]; an instrument of culture, [129].