THE CONSIDER ATION. All binding contracts must have a consider ation. In a bailment contract the consideration is the reward received or to be received. But in some kinds of bailments there is no reward given or offered; these are called gratuitous bailments. In these the inconve nience or detriment to the bailor in parting with his property, is the consideration for the express or im plied promise of the bailee to use due care and skill in dealing with it.