A concise manual presenting rules and examples for English punctuation, capitalization, letter-writing, and proofreading. It explains functions of major marks—comma, semicolon, colon, period, question and exclamation points, dash, parentheses, brackets, quotation marks, apostrophe, hyphen—and shows how they clarify relationships within sentences. The author illustrates principles with examples from esteemed writers, notes allowable variations in usage, and offers pedagogical advice for teaching punctuation through students' own writing. Practical guidance covers business correspondence, typographical proofreading, and systematic exercises to develop clear, consistent written expression.