ten o'clock
As the evening advanced the cold became more biting . They stirred up the fire with a long stick and the glowing coals threw out increased warmth . The four sleeping girls stirred uneasily , and Madge , putting her hand against the back wall of rock , found that it had cooled . `` When it comes ten o'clock , '' she said , consulting the watch she carried , `` we 'll wake them up , make them stir around a bit , and we 'll drag all these coals over against the rock again . Then we 'll heap on the rubbish and heat up the stones once more . We ought to keep warm after that till near daylight . '' `` The smut is spoiling our clothes , '' said Ruth .