Letter from Reverend [James] Challis, Cambridge Observatory, to Lieutenant-Colonel Edward Sabine, Foreign Secretary of the Royal Society Forwarding a list of institutions and individuals abroad to whom Challis would like to send the Cambridge Observations from 1842. The end of the list contains a note in another hand, likely a comment from the Society, that it does not send observations to the observatory at Speyer [Germany]. 26 December 1845