 The "Decretals of Gregory IX" differ widely from modern codes.Instead of containing in one concise statement a legislative decision, they generally start with an account of a controversy, the allegations of the parties in dispute, and a demand or the solution of the question; this "species facti" or the "pars historica" has no juridical value whatever.The enacting part of the chapter ("pars dispositiva") alone has the force of law; it contains the solution of the case or the statement of the rule of conduct.