The volume contains papers given at the 30th Colloquium of Linguistics, whose leading (but not exclusive) theme was 'Language and Cognition'. The papers represent various domains of linguistics and range from purely theoretical (e.g. those dealing with language sign and categorical grammar), through descriptive and historical, to application-oriented (glottodidactics and translation). Computer linguistics is also represented. The papers deal with a number of languages (English, French, German, Gothic, Hebrew, Hungarian, Italian, Icelandic, Polish, including Kashubian, and others). The problem of artificial languages is considered, too.