Letter from John Backhouse, Foreign Office, to the Marquis of Northampton [President of the Royal Society] Relating to the Society's request concerning an observatory in Egypt for the investigation into terrestrial magnetism. Backhouse relays Viscount Palmerston's instruction to the Consul General in Egypt to use officers with the Pasha of Egypt in support of this application. [Read by Council on 9 January 1840.] 18 December 1839