This edition, prepared by an international team of early modern scholars and based on Baxter's autograph manuscript where this is extant, for the first time makes this unique work available in a reliable text with a full supporting apparatus. This apparatus includes: extensive general and textual introductions; explanatory commentary and textual notes; supporting documentation, much of it never before published; a detailed chronology; an expository linguistic and historical glossary; the fullest available bibliography of Baxter 140 or so published titles, whose occasion and publication are a recurrent topic in the text; and four indexes.