four in the
morning
Remember that speed must be the keynote of your work . '' * * * * * The telephone bell at the head of Dr. Bird 's bed woke into noisy activity . The doctor roused himself and took down the instrument sleepily . A glance at the clock showed him that it was four in the morning and he muttered a malediction on the one who had called him . `` Hello , '' he said into the receiver . `` Dr. Bird speaking . '' `` Doctor , '' came a crisp voice over the wire , `` wake up !