The Commentaries is divided into four books. The first, introduced by Stanley N. Katz, deals with what Blackstone called "the rights of persons," what a modern lawyer would call constitutional law, the legal structure of government. Book II includes an introduction by A. W. Brian Simpson and describes the law of property. Book III, introduced by John H. Langbein, analyzes civil procedure and remedies. The last book, which is devoted to criminal law and procedure, includes an introduction by Thomas A. Green.