In reply to your letter of the 4th inst. [instant] I beg to inform you that the Council has fixed the selling price of Lendenfeld's Monograph of the Horny Sponges at 21/- and that you can have any number of copies that you may require at 14/ nett in cloth boards - Acct [Account] to be settled every six months.
Yours very faithfully,
Treas. R.S. [Treasurer, Royal Society]'.