If by agreement of the parties the time and manner of notice is specified, such notice shall be given as the agreement provides, and when given by the landlord, shall entitle him to all the benefits of the preceding sections, without any other notice. P.L.L., 1860, §889 1888, §864 1915, §851 1927, §851 1930, §851 1938, §1132 1949, §735 1969, §9-20 1898, ch. 123, §851