Copy letter from Robert William Frederick Harrison to The Curator of Books, The Brooklyn Institute of Arts and Science, Eastern Parkway, Brooklyn, NY, USA 'Dear Sir, Referring to your letter of April 1st, the Royal society will have pleasure in presenting the Brooklun Institute with a copy of the "Monograph of horny sponges". The copy is being sent off to-day by Wheatly's Agency, and all we shall ask you to do is to pay the small freight charge on delivery.' 18 April 1910