Enter the cargo liner. Its passenger complement is at least 60--large enough to supply companions of interest at meals and social occasions--and occasionally reaches a high of 80 or 90 persons. Most liners have a passenger age limit of 79. Voyages are invariably scheduled and regular; and aboard the ship, the passenger-carrying function is almost as important to officers and crew as the hauling of cargo. There are frequent social activities, although matters never reach the activities-full levels of the passenger cruise ships.