Unless a house has a ballroom the room selected for dancing must have all the furniture moved out of it; and if there are adjoining rooms and the dancing room is not especially big, it adds considerably to the floor space to put no chairs around it. Those who dance seldom sit around a ballroom anyway, and the more informal grouping of chairs in the hall or library is a better arrangement than the wainscot row or wall-flower exposition grounds. The floor, it goes without saying, must be smooth and waxed, and no one should attempt to give a dance whose house is not big enough. =ETIQUETTE IN THE BALLROOM= New York's invitations are usually for "ten o'clock" but first guests do not appear before ten-thirty and most people arrive at about eleven or after. The hostess, however, must be ready to receive on the stroke of the hour specified in her invitations, and the débutante or any one the ball may be given for, must also be with her. It is not customary to put the débutante's name on the formal "At Home" invitation, and it is even occasionally omitted on invitations that "request the pleasure of ----" so that the only way acquaintances can know the ball is being given for the daughter is by seeing her standing beside her mother. Mr. & Mrs. Robert Gilding request the pleasure of [Name of guest is written here] company on Tuesday, the twenty-seventh of December at ten o'clock at the Fitz-Cherry Dancing R.s.v.p. Twenty-three East Laurel Street The hostess never leaves her post, wherever it is she is standing, until she goes to supper. If, as at the Ritz in New York, the ballroom opens on a foyer at the head of a stairway, the hostess always receives at this place. In a private house where guests go up in an elevator to the dressing rooms, and then walk down to the ballroom floor, the hostess receives either at the foot of the stairway, or just outside the ballroom. =THE HOSTESS AT A BALL= Guests arriving are announced, as at a dinner or afternoon tea, and after shaking hands with the hostess, they must pass on into the ballroom. It is not etiquette to linger beside the hostess for more than a moment, especially if later arrivals are being announced. A stranger ought never go to a ball alone, as the hostess is powerless to "look after" any especial guests; her duty being to stand in one precise place and receive. A stranger who is a particular friend of the hostess would be looked after by the host; but a stranger who is invited through another guest should be looked after by that other.