The book "The Art or Craft of Rhetoric" by Leonard Cox is a professional manual on rhetoric that remains a relevant and valuable resource for learning the art of persuasive speech. In his book, the author addresses the reader with care and skill, providing visual advice and examples for improving one's own skills in the field of public speaking. The refined language and sophisticated logic of the book make it not only a useful source of information, but also an exciting read for anyone seeking to improve their communication skills.