This corpus-based study examines the orthographic systems in thirteen editions of the (1506–1656), a comprehensive compendium of prose and verse texts of different length and on a variety of subjects, for example, astronomy, agriculture, medicine, and religion. It focuses on the variation and consistency levels in the early-modern printers’ spelling practice, and evaluates the potential importance of extra-linguistic motivation for the identified regularising changes from the language authorities of the time, including lexicographers, spelling reformers, orthoepists, grammarians, and schoolmasters. Additionally, the book provides the reader with a brief overview of the printers’ punctuation, capitalisation, and word-division conventions, as well as with selected bibliographical and textual information concerning the publication history of the .weiterlesen