Copy letter from Robert William Frederick Harrison to James M Muir, Hakalau Plantation Company, Hakalau, Hawaii, USA Feb 7th and to say that the paper on [sextants], published in 1883, is contained in Proceedings no 224, published at 4/6. The first paper is in Proceedings no 94, published at 2/6. The numbers can be had of Messrs Harrison & Sons, 45 St Martin's Lane, London, WC.' 4 March 1913