ten o'clock
Betty had been sure she heard the camera click , but Mary had grinned and told her not to be so vain of her back . However , nobody recognized the picture . The few sophomores who knew anything about it were pledged to secrecy , as the grinds were never allowed to become too personal , and the freshmen treated the telegram as an amusing myth . In a few minutes every one was dancing again , and only too soon it was ten o'clock . `` Was n't it fun ? '' said Betty enthusiastically , as she and Helen undressed . `` Oh yes , '' agreed Helen .