Copy letter from Herbert Rix, to Henry Wilde, Fellow of the Royal Society 'Dear Sir, Prof [Professor] Frank H Bigelow of the U.S. Weather Bureau, Department of Agriculture, Washington, has asked us to send him a copy of your "papers on the secular changes of Terrestrial Magnetism". We have no copies, but those which you have sent for the library. If you have any for distribution you might perhaps like to send him one as a gift from yourself? Yours truly Herbert Rix Asst Sec RS [Assistant Secretary, Royal Society] His address is: Prof F H Bigelow, 1416 K. Street. N.W., Washington D.C., U.S.A'. 31 December 1891