In the early 1900s, the language of America was becoming colloquial English-the language of the businessman, manager, and professional. Since college and high school education were far from universal, many people turned to correspondence education-that era's distance learning-to learn the art of speaking and writing. By the 1920s and 1930s, thousands of Americans were sending coupons from newspapers and magazines to order Sherwin Cody's 100% Self-correcting Course in the English Language, a patented mail-order course in English that was taken by over 150,000 people.

Cody's ubiquitous signature advertisement, which ran for over forty years, promised a scientifically-tested invention that improved speaking and writing in just 15 minutes a day. Cody's ad explained that people are judged by their English, and he offered self-improvement and self-confidence through the mail.

In this book, linguist Edwin Battistella tells the story of Sherwin Cody and his famous English course, situating both the man and the course in early twentieth century cultural history. The author shows how Cody became a businessman-a writer, grammatical entrepreneur, and mass-marketer whose ads proclaimed "Good Money in Good English" and asked "Is Good English Worth 25 Cents to You?" His course, perhaps the most widely-advertised English education program in history, provides a unique window onto popular views of language and culture and their connection to American notions of success and failure. But Battistella shows Sherwin Cody was also part of a larger shift in attitudes. Using Cody's course as a reference point, he also looks at the self-improvement ethic reflected in such courses and products as the Harvard Classics, The Book of Etiquette, the Book-of-the-Month Club, the U.S. School of Music, and the Charles Atlas and Dale Carnegie courses to illustrate how culture became popular and how self-reliance evolved into self-improvement.