ten o'clock
Wo n't you come and see us ? '' The little freshman promised . By that time the `` plowed field '' was ready -- an obliging friend had stayed at home from the frolic to give it an early start -- and they ate the creamy brown squares of candy with a marshmallow stuffed into each , and praised the cook and her wares until a bell rang and everybody jumped up and began saying good-bye at once except Betty , who had to be enlightened by the campus girls as to the dire meaning of the twenty-minutes-to-ten bell . `` Do n't you keep the ten o'clock rule ? '' asked the fluffy-haired freshman curiously . `` Oh , yes , '' said Betty . `` Why , we could n't come to college if we did n't , could we ? ''