To call on an acquaintance in an opera
       box does not relieve one of the duty of making
       a formal call in return for social favors.

When calling on the hostess but not on the host, a man should leave a card for him.  If the hostess be out, he should leave two cards.

Married men can return their social obligations to women by personal calls, or the women of the family can leave the men’s cards with their own.

A call should be made the day following a luncheon or a breakfast; the same after a dinner, or at least within a week.  A call should be made within a week after a ball.

After a theatre party given by a man, he should call within three days on the woman he escorted, or leave his card, and should call within a week on the remainder of his guests.

  Men calling on men.  At the beginning of
       the season it is usual to leave a card for each
       member of a family called on—­one card for
       husband, wife, “misses,” and guest, or rest
       of the family.  Sometimes two cards answer
       the purpose.

       They may be sent by mail or messenger.

  Men calling on women.  A man should call
       only on “At Home” days, especially when
       making the first call, unless specially invited. 
       He should call at the hour appointed.

When no special day for receiving is indicated, calls may be made at any proper hour, according to the custom of the locality.  Men of leisure may call at the fashionable hours —­from two till five o’clock.

Business and professional men may call between eight and nine o’clock, as their obligations prevent them from observing the fashionable hours.

       A business man may call in street dress
       before six o’clock, and the same dress in the
       evening, if intimately acquainted.

Informal calls may be made on Sunday after three o’clock by business and professional men, provided there are no religious or other scruples on the part of those receiving the calls.

       Evening or other than mere formal calls
       should not be made, save by special invitation.

       The first call should last not longer than
       ten or fifteen minutes.  It is correct to ask
       for all the women of the family.

At the first call he should give his card at the door.  At following calls it is optional whether to give a card or merely the name, asking at the same time for the person one desires to see.  When the servant’s intelligence seems doubtful, or the name is an unusual one, it is safer to give a card.

When a woman invites a man to call without specifying when, it is not considered