Each letter written on Royal Institution of Great Britain embossed notepaper. Five letters, 1895 Aug. 25-Sept. 7 concern: Dewar's work on the low-temperature thermoelectric properties of bismuth; detection of impurities in bismuth; the writing of joint papers with Liveing, especially on their investigation of CN band spectra; unfavourable comments on Crookes's and Ramsay's work on the argon spectrum; his own and his wife's poor health. One letter, 1907 June 18 states his need for radium bromide.