seven o'clock
He walked slowly up and down the room thinking , whilst his mother watched him very anxiously . `` My dear Clement , '' Mrs. Austin exclaimed at last , `` you really quite alarm me . You set out this afternoon upon some mysterious expedition with Margaret ; and though I ask you both where you are going , you both refuse to satisfy my very natural curiosity , and look as solemn as if you were about to attend a funeral . Then , after ordering dinner for seven o'clock , you keep it waiting nearly two hours ; and you come in without Margaret , and seem alarmed at not seeing her here . What does it all mean , Clement ? '' `` I can not tell you , mother . '' `` What !