19. Save where the Law or these rules otherwise provide, where a person is required to give security, such security shall be in the form of a bond with one or more sureties to the person to be secured, or, in lieu thereof, by a deposit in Court with a memorandum setting out the conditions. The amount to be inserted in the bond or to be deposited in Court shall include the probable costs. The bond or the memorandum shall be signed in the presence of the Registrar.