Copy letter from Robert William Frederick Harrison, to H Kilburn Scott, Rio de Janeiro, Brazil, (104 Palmerston House, E.C.) In reply to Scott's letter of 31 July, the papers by Messrs Dunstan and Blake, on 'Thorianite, a new mineral from Ceylon' was published in the 'Proceedings of the Royal Society', A510, priced two shillings and six pence, and may be purchased from Messrs Harrison & Sons, 45 St Martin's Lane, London, W.C.. 23 August 1905