“ This Court has been generous in excusing errors of counsel, but if there are to be rules, there must be some limit to our willingness to overlook their violation. While we are inclined to be generous in exercising our discretion to forgive a mistake and waive the consequences of negligence, fairness to other counsel and to parties with business before the Court as well as due regard for our own procedures leads us to believe that this case does not warrant our indulgence. ”