All conveyances and deeds, and all writings whatsoever which may be recorded in any register of sasines, shall, previous to being presented for registration, have a warrant of registration endorsed or written thereon in or as nearly as may be in such one or other of the forms of warrants of registration contained in the following schedules hereto annexed, viz. schedule (F.) No. 2, and schedule (H.) Nos. 1, 2, and 3, as may be applicable to the particular conveyance, deed, or writing so to be presented, which warrant shall in every case specify the person or persons on whose behalf the conveyance, deed, or writing is presented for registration, and . . . F2 the register or registers of the county or counties, . . . F2 in which the lands to which such conveyance or deed or writing has reference are situated, and shall be signed by such person or persons, or by his or their agent or agents, and in the latter case the warrant may be signed either by an individual agent or by the subscription of any firm of which such agent may be a partner: . . . F3 Provided always, that where registration has been or shall be made in any particular register of sasines, it shall be sufficient that such register is specified in the warrant of registration without any specification of a county or counties.