We infer that other groups of related languages, such as the Germanic (or the Slavic or the Celtic), which show a similar resemblance, have arisen in the same way; it is only an accident of history that for these groups we have no written records of the earlier state of the language, as it was spoken before the differentiation set in. To these unrecorded languages we give names like Primitive Germanic (Primitive Slavic, Primitive Celtic, and so on).