The concept of a language may find expression in various ways and at various levels. It may take the form of myth, legend, or folklore. It may also in certain circumstances become the focal point of an explicit body of knowledge, doctrines, practices and methods of inquiry, tending towards the establishment of what is nowadays usually called a 'study', or 'discipline', or 'science' ~ overtly concerned with linguistic matters. (Harris 1980: 31).