law: Petroleum Act, 1934
  22. Special rules for testing viscous or solid forms of
  
  petroleum
  The Central Government may also make rules providing specially
  
  for the testing of any form of petroleum which is viscous or solid or contains
  
  sediment or thickening ingredients, and such rules may modify or supplement any
  
  of the provisions of this Chapter or of the rules made under section 21 in order
  
  to adapt them to the special needs of such tests.