Negotiable Instruments Act, 1881—Sections 138, 139—Dishonour of cheque—Presumption—Once signature admitted, presumption arises that cheque was issued for discharge of debt—Burden shifts to accused to rebut by raising plausible defence—Mere assertion of financial incapacity of complainant without evidence insufficient—Non-response to statutory notice adverse to accused—Defence of blank cheque for bank loan held improbable. ...