The physical characteristics of a normal mode are that an impulse of a particular normal type generates an initial velocity of that type only, and that a constant extraneous force of a particular normal type maintains a displacement of that type only.
Yet in other physical characteristics the Japanese, the Koreans and the Chinese resemble each other so closely that, under similar conditions as to costume and coiffure, no appreciable difference is apparent.
On the east coast are the Malagasy, who in physical characteristics stand halfway between the Hova and the Sakalava, the last occupying the remaining portion of the island and displaying almost pure Negroid characteristics.
Chiefly owing to the dryness of climate, its physical characteristics are similar to those of Mongolia proper, except that the altitude of the plains is much lower.
Since the passing of the Light Railways Act of 1896, which did not apply to Ireland, it is possible to give a formal definition by saying that a light railway is one constructed under the provisions of that act; but it must be noted that the commissioners appointed under that act have authorized many lines which in their physical characteristics are indistinguishable from street tramways constructed under the Tramways Act, and to these the term light railways would certainly not be applied in ordinary parlance.
They are not pure Hamites, and their physical characteristics vary considerably, showing signs of interbreeding with Galla, Afar, Arabs, Abyssinians, Bantus and Negroes.
Of the first the physical characteristics are a small, thin-limbed body, hair black, short and woolly, projecting jaws, rounded, narrow, retreating forehead, long and narrow head, enormous eyebrow ridges, flat nose and dark skin.