4. The writing may be drawn up by a notary under the form of a summons or putting in default and be served upon the proprietor or agent by the notary who drew it up. It may also be under private signature, provided that it be made in duplicate and bear the signatures of two witnesses, one of whom shall testify under oath, before a judge, magistrate or any official authorized to administer oaths, that he was present at the signing of the writing and that he saw the lessee or holder of the immoveable as well as the other witness affix their signatures.
R. S. 1964, c. 322, s. 4.