A key to the art of letters, or, English a learned language, full of art, elegancy and variety : being an essay to enable both foreiners, and the English youth of either sex, to speak and write the English tongue well and learnedly, according to the exactest rules of grammar, after which they may attain to Latin, French, or any other forein language in a short time ... : with a preface shewing the necessity of a vernacular grammar ... /