This introduction to the historical study of language is designed to give ninth-grade students contact with the methods of historical linguistics in a relatively limited area--the study of the lexicon. The unit begins with a consideration of recent changes in the lexicon, especially those due to technological advances which have caused the use of old words in new senses and the coinage of new words from established root words. This preparatory material is followed by an examination of earlier lexical changes and their relationships to historical developments: wars, scientific advances, invasions of England, religious movements, and English colonization. Selections from early and contemporary writings are suggested as a basis for the study; and sample lectures, discussion questions, worksheets, and examination questions are included. (JS)