Morgan, Lewis H., beginning of civilization, [4]; classification of social development, [49].
Morton, William, T. G., [470].
Mound builders, [197].
Music, as language, [131]; as a socializing factor, [133], [137].
Mutual aid, [120]; of nations, [491].
Napier, John, [463].
Napoleon Bonaparte, [417].
Nationality and race, [444].
Nature, aspects of, determine types of social life, [147].