Copy letter from Herbert Rix, to Professor William Edward Ayrton, Fellow of the Royal Society, 41 Kensington Park Gardens, W. 'The paper by Mr. Gray "On a Method of determining the Thermal Conductivity of Metals" is now passing through the press. I am, yours truly, H Rix Asst. Sec. R.S. [Assistant Secretary, Royal Society]'. 25 April 1895