Section 3. The plaintiff shall declare on his own seisin within twenty years then last past, without specifying any particular day, and shall allege a disseisin by the defendant, but need not aver a taking of the profits. He shall set forth the estate which he claims in the land whether in fee simple, fee tail or for life, and if the latter, whether for his own life or for the life of another, but he need not set forth the original gift, devise or other conveyance or title by which he claims the estate.