It is the relation of the individual perspective to the common perspective that is of importance. To the biologist there is a common environment of an ant hill or of a beehive, which is rendered possible by the intricate social relationships of the ants and the bees. It is entirely improbable that this perspective exists in the perspectives of individual ants or bees, for there is no evidence of communication. Communication is a social process whose natural history shows that it arises out of cooperative activities, such as those involved in sex, parenthood, fighting, herding, and the like, in which some phase of the act of one form, which may be called a gesture, acts as a stimulus to others to carry on their parts of the social act. It does not become communication in the full sense, i.e., the stimulus does not become a significant symbol, until the gesture tends to arouse the same response in the individual who makes it that it arouses in the others. The history of the growth of language shows that in its earlier stages the vocal gesture addressed to another awakens in the individual who makes the gesture not simply the tendency to the response which it calls forth in the other, such as the seizing of a weapon or the avoiding of a danger, but primarily the social role which the other plays in the cooperative act. This is indicated in the early play period in the development of the child.