two o'clock
`` Oh , I think he will . You know he has already promised to give us a course in geology this summer , and a lesson in surveying this section . Then he 's always willing to give us a chance to put what we 've learned into practical use . '' `` We 'll ask him when he gets here at two o'clock . '' So the matter remained open ; and Blake and Cooper , who had stopped playing , resumed their interrupted game . The others watched them , forgetting more serious affairs . -- All but Tom , who felt restive and impatient to enlist the services of the constable , and to carry out his other idea .