Every rate which the commissioners are by this or the special Act authorized to make or levy shall be made and levied by them at yearly, half-yearly, or such other periods as they think fit, upon every person who occupies any of the prescribed kinds of property, or (if no property be prescribed) any house, shop, warehouse, counting-house, coach-house, stable, cellar, vault, building, workshop, manufactory, garden, land, or tenement whatsoever, (except as herein-after is excepted,) within the limits of the special Act, or of the district where such rate is assessed on the occupiers of lands and buildings of a separate district, as herein-before provided, according to the full net annual value thereof respectively; and the said rates shall be vested in the commissioners, and shall be payable at such times as they appoint: Provided always, that every personoccupying lands used as arable, meadow, or pasture ground only, or as woodlands or market gardens or nursery grounds, shall be rated in respect of the same in the prescribed proportion only, if no proportion be prescribed, in the proportion of one third part only of such net annual value thereof as aforesaid.