law: Indian Post Office Act, 1898 
  75. Delegation of powers, other than rule-making powers,
  
  to Director General
  The Central Government
  
  may, by notification in the Official Gazette, authorize, either absolutely or
  
  subject to conditions, the Director General to exercise any of the powers
  
  conferred upon the Central Government by this Act, other than a power to make
  
  rules.