law: Transfer of Property Act, 1882
  81. Marshalling securities
  If the owner of two or more properties mortgages them to one
  
  person and then mortgages one or more of the properties to another person, the
  
  subsequent mortgage is, in the absence of a contract to the contrary, entitled
  
  to have the prior mortgage-debt satisfied out of the property or properties not
  
  mortgaged to him, so far as the same will extend, but not so as to prejudice
  
  the rights of the prior mortgagee or of any other person who has for
  
  consideration acquired an interest in any of the properties.