An Act to defray the Charge of the Pay, Clothing, and contingent Expenses of the Disembodied Militia in Great Britain; and to grant Allowances in certain Cases to Subaltern Officers, Adjutants, Quartermasters, Surgeons, Surgeons' Mates and Serjeant Majors of Militia, until the Twenty-fifth Day of March One thousand eight hundred and twenty-one.