Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Dr J. Monroe Thorington; 2031 Chestnut Street, Philadelphia With further reference to Dr J. Monroe Thorington's enquiry about David Douglas' papers, informs him that two letters from Douglas have been found in the [Edward] Sabine letters - one is from Douglas to Joseph Sabine (the horticulturalist) and another unaddressed. Suggests Monrie Thorington also enquires at the Royal Artillery Institution in Woolwich, and at the Royal [Botanic] Gardens in Kew. 1 September 1927