law: Indian Trusts Act, 1882 
  21. Mortgage of land Pledged to government under Act 26 of
  
  1871-Deposit in government savings bank 
  Nothing in section 20 shall apply to investments made before
  
  this Act comes into force, or shall be deemed to Preclude an investment on a
  
  mortgage of immovable property already pledged as security for an advance under
  
  the Land Improvement Act, 1871 (26 of 1871), or in case the trust-money does
  
  not exceed three thousand rupees, a deposit thereof in a government savings
  
  bank.