can do is to reveal the history of language. And in this history, human language stands revealed as a highly refined development of the crude and undifferentiated expressions which, under emotional stress, are uttered by all the animals. LANGUAGE AS A SOCIAL HABIT. Language, as has repeatedly been pointed out, is essentially social in character. It is, in the first place, primarily an instrument of communication between individuals, and is cultivated as such. In human speech, interjections like "Oh!" or "Ah!" are still involuntary escapes of emotion, but language develops as a vehicle of communication to others rather than as a mere emotional outlet for the individual. Even if it were possible for the mythical man brought up in solitude on a desert island to have a language, it is questionable whether he would use it. Since language is a way of making our wants, desires, information known to others, it is stimulated by the presence of and contact with others. Excess vitality may go into shouting or song,[1] but language as an instrument of specific utterance comes to have a more definite use and provocation. Man, as already pointed out, is a highly gregarious animal, and language is his incomparable instrument for sharing his emotions and ideas and experience with others. The whole process of education, of the transmission of culture from the mature to the younger members of a society, is made possible through this instrument, whereby achievements and traditions are preserved and transmitted in precise and public terms. [Footnote 1: Human song is by some linguistic experts, including Bloomfield, held to have originated in the chant of rhythmic labor, as in rowing or threshing.]