In the missions there are a few villages where families belong to different tribes, speaking different languages. Societies composed of such heterogeneous elements are difficult to govern. In general, the padres have settled whole tribes, or large parts of them, in villages not far from each other. The Indians see only those of their own tribe, for lack of communication and isolation are the main aims of missionary policy. Among the tamed Chaimas, Caribs and Tamanacs racial characteristics are retained if they are allowed to keep their respective languages. If man's individuality is reflected in his dialects, then these in their turn influence thoughts and feelings. This intimate link between language, national character and physical constitution ensures the differences and idiosyncrasies of the tribes, which in turn constitutes an unending source of movement and life at the mental level.