In our opinion the opening words of the clause cannot be read as creating only an obligation to pay the amount advanced and interest on that amount, together with such other amounts as may be added to the principal sum pursuant to other provisions in the mortgage. The obligation is to pay upon demand "all such further and other sums of money as are now or hereafter shall become due owing or payable upon any account whatsoever " (emphasis supplied). These words are appropriate to pick up not only liabilities which arise subsequently to the giving of the mortgage and whilst it subsists, but also liabilities which are contingent at the date of execution of the mortgage and cease to be contingent during the subsistence of the mortgage. The amount owing in respect of a liability, initially contingent, which nevertheless ceases to be contingent during the currency of the mortgage is a sum of money which has "become due owing or payable" within the meaning of the clause. If it be owing upon another account, because it is owing by the mortgagor in its capacity as a guarantor, it is none the less owing upon an account which falls within the words "upon any account whatsoever". The subsequent formulation "and whether such sums of money shall be advanced or paid by the Mortgagee to or for the Mortgagor or on the Mortgagor's account or otherwise howsoever" is an elaboration of what precedes it. If resort is had to the subsequent formulation for the purpose of elucidating the meaning of the preceding provision, there is no reason to think that it does not extend to a liability of the mortgagor arising under a guarantee given in connexion with a loan made by Lombard to an associated company of the mortgagor, probably at the request of the mortgagor, to enable that company to engage in a specific land development project similar to the Kingston Park Estate undertaken by Cambridge itself and financed by Lombard. Moneys so advanced or paid by the mortgagee are, if not paid "for the Mortgagor or on the Mortgagor's account", advanced or paid "otherwise howsoever".