four o'clock
`` Now then ! '' he cried ; and for the next hour Norah was kept hard at work , with never another word of praise , but with many sharp corrections and reminders to call attention to hitherto unsuspected faults . She was radiantly happy , nevertheless , for the first step towards correcting a fault was to discover its existence , and what was the good of a teacher who did not point out what was wrong ? At four o'clock Mr Morris took his departure , and Norah found that Edna had retired to her room to rest , as was her custom every afternoon . Mrs Freer was also invisible , but Rex came to join her in the drawing-room , looking particularly cheerful and self-satisfied . `` Well , has the old fellow departed ? How are the knuckles ?