During the middle ages, and up to the middle of the eighteenth century, the theologians’ mutilated version of the Genesis account of language origin, the divine-origin theory as it came to be called, was the theory held by Christian Europe. In the eighteenth century, however, the question of the probability of a natural rather than a supernatural origin of language began to stir in men’s minds. Rousseau’s essay on the Origin of Languages, about 1750, might be taken as the historical landmark which stands between the old and new points of view. This essay is in itself disappointing to one who is acquainted with Rousseau’s other works. His mental interests were practical rather than speculative, and he had no real convictions about the question of language as he had about education, society, and government. He was interested in language, and the changes in language, in relation to the practical needs of the people in social and national groups, and in diverse climatic conditions, rather than in the origin of language itself as an instrument of human reason. As a consequence his essay on the Origin of Languages—not ‘Language’—is hardly more than a series of disconnected reflections upon various aspects of languages, including a discussion of the relation of language to melody and harmony in music which occupies about one-third of the essay.