Copy letter from Robert William Frederick Harrison, to J Bruce, Callithie, Gartly, N.B. 'Dear Sir, The paper "On the Function of Silica in the Nutrition of Cereals." - Part I. by Mr A. D. Hall and Mr C. G. T. Morison, is in the press, and will be published shortly. It may then be obtained of Messrs Harrison & Sons, 45 St Martin's Lane, W.C. I am, faithfully yours, Robt [Robert] Harrison Assistant Secretary R.S. [Royal Society]'. 16 March 1906