practice. A detailed informal statement of a plaintiff is cause of action, or of the defendants’ set-off. 2. In all actions in which the plaintiff declares generally, without specifying his cause of action, a judge upon application will order him to give the defendant a bill of the particulars, and in the meantime stay, proceedings. 3 John. R. 248. And when the defendant gives notice or pleads a set-off, he will be required to give a bill of the particulars of his set-off, on failure of which he will be precluded from giving any evidence in support of it at the trial. The object in both cases is to prevent surprise and procure a fair trial. The bill of particulars is an account of the items of the demand, and states in what manner they arose.