A receipt is not conclusive evidence of payment, but it throws the burden of proof upon him who attempts to impeach if.

3256. Receipts may be either in full of all demands, for a special account, in part payment of an account, or for a special purpose.

3257. The arrangement of the wording of a receipt is not important if the object and time be distinctly stated in it.

3258 A general receipt "in full of all demands "is a discharge of all debts except specia debts undear seal

3259. The legality of signatures, in pencil, has ever been questioned.

3260. Account books, notes, or receipts written in pencil, would not be respected in any law court.

3261. In those States in which ex emption laws are enforced, the drawer of a promissory note may expressly waive all right of benefit from those laws. Conditions which the subscriber may add to a "note of promise," if accepted by the receiver, holds good in every State, unless they directly contravene local laws.