Book excerpt: The macaronic (mixed-language) business texts of London for the period 1275 to 1500 present a rich source of evidence for the medieval dialect of London English. Hitherto they have been ignored because of mistaken ideas about their value, but Laura Wright offers a reassessment of their importance in the development of the English language. The book focuses on terminology surrounding the River Thames to present a study of the medieval dialect of London. The vocabulary survey lists many words which had previously been lost to us, and the illustrative extracts from the texts present a fascinating picture of life in medieval times on the River Thames. The author's analysis covers the orthography, phonology, and morphology of the dialect as revealed in these texts.