Copy letter from Francis Alexander Towle, Assistant Secretary and Librarian of the Royal Society; to Theodore Mackenzie Esq.; 46 Market Street, Grahamstown, South Africa In reply to Theodore Mackenzie's enquiry, sends a typed copy of the note by Halley, on Longitude of the Cape, in the Philosophical Transactions No. 185. [Enclosure not present.] Asks for more precise information on Mackenzie's query about Mason and Dixon. 8 October 1924