Letter from George Biddell Airy, on his paper 'Note on an extension of the comparison of magnetic disturbances with magnetic effects inferred from observed terrestrial galvanic currents; and discussion of the magnetic effects inferred from galvanic currents on days of tranquil magnetism' to the Secretary of the Royal Society Letter asking for the return of the original drawings of curves, as they have been 'made with great labour and do not constitute a very important part of the paper'. Subject: Astronomy [Published in Philosophical Transactions, 1870]. 7 February 1870