In the case of human societies we discover not merely organically inherited adaptation, which characterizes animal societies, but, in addition, a great body of habits and accommodations which are transmitted in the form of social inheritance. Something that corresponds to social tradition exists, to be sure, in animal societies. Animals learn by imitation from one another, and there is evidence that this social tradition varies with changes in environment. In man, however, association is based on something more than habits or instinct. In human society, largely as a result of language, there exists a conscious community of purpose. We have not merely folkways, which by an extension of that term might be attributed to animals, but we have mores and formal standards of conduct. In a recent notable volume on education, John Dewey has formulated a definition of the educational process which he identifies with the process by which the social tradition of human society is transmitted. Education, he says in effect, is a self-renewing process, a process in which and through which the social organism lives. With the renewal of physical existence goes, in the case of human beings, the re-creation of beliefs, ideals, hopes, happiness, misery and practices. The continuity of experience, through renewal of the social group, is a literal fact. Education, in its broadest sense, is the means of this social continuity of life. Under ordinary circumstances the transmission of the social tradition is from the parents to the children. Children are born into the society and take over its customs, habits, and standards of life simply, naturally, and without conflict. But it will at once occur to anyone that the physical life of society is not always continued and maintained in this natural way, i.e., by the succession of parents and children. New societies are formed by conquest and by the imposition of one people upon another. In such cases there arises a conflict of cultures, and as a result the process of fusion takes place slowly and is frequently not complete. New societies are frequently formed by colonization, in which case new cultures are grafted on to older ones. The work of missionary societies is essentially one of colonization in this sense. Finally we have societies growing up, as in the United States, by immigration. These immigrants, coming as they do from all parts of the world, bring with them fragments of divergent cultures. Here again the process of assimilation is slow, often painful, not always complete. 3. Types of Social Groups[92] Between the two extreme poles--the crowd and the state (nation)--between these extreme links of the chain of human association, what are the other intermediate groups, and what are their distinctive characteristics? Gustave Le Bon thus classifies the different types of crowds (aggregations):