six o'clock
`` Can I help you , Jack ? '' asked Thames , taking up a plane . `` No , no , let him alone , '' interposed Wood . `` He has undertaken to finish this job by six o'clock , and I wish to see whether he 'll be as good as his word . '' `` He 'll have hard work to do it by that time , father , '' remonstrated Thames ; `` you 'd better let me help him . '' `` On no account , '' rejoined Wood peremptorily . `` A little extra exertion will teach him the advantage of diligence at the proper season .