case brown versus Barkham Eq can ab pl mortgagor reserve pound per content  with proviso to take pound per amt if pay within three month after due if a  great arrear court will not relieve by if but a small slip of time interest  compute by the master report shall carry interest but where the mortgagor sign  a account whereby so much be admit to be due for interest this will not carry  interest unless the mortgagor by any letter or write under his hand agree to  make it principal one make a mortgage at pound per cent interest with a  proviso to accept pound per cent if pay within three month after due there be  a great arrear of interest the mortgagee send a account in write of the sum  due to he for interest compute it at pound per cent and the mortgagor return a  answer allow the account desire forbearance and promise to make satisfaction  to the mortgagee for the same peer William object this letter sign by the  mortgagor make the account a state one and the interest from thence ought to  carry interest since promise satisfaction upon forbearance can mean nothing  else and as the account send in be at the rate of pound per cent this promise  must be intend of some far satisfaction beyond that interest also where the  mortgagor admit by write under his own hand the quantum of the interest due it  be as strong l when a master by his report compute it Lord Parker it be true a  master report compute interest make that interest principal and to carry  interest for a report be as a judgement of the court and appoint a day for the  payment carry on interest to that day and the party disobedience to the court  in not comply with the time of payment ought to subject he to interest but  suppose the mortgagor sign a account whereby he own so much money due for  interest I question whether this will make the interest principal because of  itself it do not show any agreement or intent to alter the interest or the  nature of that part of the debt or turn it into principal neither do it appear  to have be ever so determine I conceive to make interest on a mortgage  principal it be requisite there shall be a write sign by the party for as much  as the estate in the land be to be charge therewith but in the principal case  the mortgagor do fulfil his promise make satisfaction to the mortgagee for his  forbearance since this proviso oblige the party to pay pound per cent on  default of pay pound within three month after due be general look upon as a  penalty and in terror and to be relieve against if only a very short time peer  William have happen though it may not be relievable against in case of a long  arrear of interest however this si per cent be a satisfaction and a  considerable one too but the court at the same time declare if there have not  be such a penalty of per cent instead of pound and a great arrear of interest  incur it will on such a promise in write to make a satisfaction for  forbearance have give the mortgagee some allowance in this respect so Kelly v  Lord Bellew I bro p c and Edward bro p c Bacon v clerk ante Burton v slattery  bro p c Neal v attorney general mos Astley v powis l ves Bickham v cross ves  it be not the practice to compute interest upon interest allow by the report  in any other case but that of a mortgage see car v Burlington ante and case  there cite particular creme v hunter Ves jun bro c c turner v turner I W  Litton v Litton ante but interest upon interest will be allow where it be so  agree between the party Boddam v Riley bro c c Macarthy v Llandaff ba be  clancarty v latouche ib peer William er p peer William de term S michaelis