refore his authority must be in writing under seal, and when the deed is recorded, the agent's written authority should also be recorded; this is the usual practice. If this is not done, some person who afterward wished to purchase the land might object because the recorded title was defective.
A particular usage or custom also affects an agent's powers. If the principal confers on him authority to transact business of a well-defined nature, bounded by well-defined usage and customs, the law presumes the agency was created with reference to them. This protection affects agents and third persons alike, the latter therefore who act in good faith in such dealings are protected against secret limitations of which they had no notice.
An agent has no authority to purchase his principal's property. To do this, in a sense, would be to purchase of himself. The temptation to do this is sometimes very great, too great for him to withstand, and so he resorts to a crooked method for accomplishing his end. He