change through time) or synchronically (the actual rules). Saussure notes that a person joining the audience of a game already in progress requires no more information than the present layout of pieces on the board and who the next player is. There would be no additional benefit in knowing how the pieces had come to be arranged in this way. Geographic linguistics A portion of Course in General Linguistics comprises Saussure's ideas regarding the geographical branch of linguistics. According to Saussure, the geographic study of languages deals with external, not internal, linguistics. Geographical linguistics, Saussure explains, deals primarily with the study of linguistic diversity across lands, of which there are two kinds: diversity of relationship, which applies to languages assumed to be related; and absolute diversity, in which case there exists no demonstrable relationship between compared languages. Each type of diversity constitutes a unique problem, and each can be approached in a number of ways. For example, the study of Indo-European languages and Chinese (which are not related) benefits from comparison, of which the aim is to elucidate certain constant factors which underlie the establishment and development of any language. The other kind of variation, diversity of relationship, represents infinite possibilities for comparisons, through which it becomes clear that dialects and languages differ only in gradient terms. Of the two forms of diversity, Saussure considers diversity of relationship to be the more useful with regard to determining the essential cause of geographical diversity. While the ideal form of geographical diversity would, according to Saussure, be the direct correspondence of different languages to different areas, the asserted reality is that secondary factors must be considered in tandem with the geographical separation of different cultures. For Saussure, time is the primary catalyst of linguistic diversity, not distance. To illustrate his argument, Saussure considers a hypothetical population of colonists, who move from one island to another. Initially, there is no difference between the language spoken by the colonists on the new island and their homeland counterparts, in spite of the obvious geographical disconnect. Saussure thereby establishes that the study of geographical diversity is necessarily concentrated upon the effects of time on linguistic development. Taking a monoglot community as his model (that is, a community which speaks only one language), Saussure outlines the manner in which a language might develop and gradually undergo subdivision into distinct dialects. Saussure's model of differentiation has 2 basic