46. The making, acceptance or indorsement of a promissory note, bill of exchange or cheque is completed by delivery, actual or constructive. As between parties standing in immediate relation, delivery to be effectual must be made by the party making, accepting or indorsing the instrument or by a person authorised by him in that behalf. As between such parties and any holder of the instrument other than a holder in due course, it may be shown that the instrument was delivered conditionally or for a special purpose only, and not for the purpose of transferring absolutely the property therein. A promissory note, bill of exchange or cheque payable to bearer is negotiable by the delivery thereof. A promissory note, bill of exchange or cheque payable to order is negotiable by the holder by indorsement and delivery thereof.