Copy letter from Michael Foster, to Rev Dr George Salmon, Fellow of the Royal Society 'Sir, I have the pleasure to inform you, that the President & Council of the Royal Society have awarded to you the Copley Medal for your various papers on subject of Pure Mathematics, and for the valuable Mathematical Treatises of which you are the author. I am, your obedient servant, M Foster Sec R.S. [Secretary, Royal Society] 31 October 1889