[Letters (6)] 1895 and 1907 [to G.D.] Liveing/James Dewar, re his 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 Jun 18, states his need for radium bromide.]