Referee's report by Thomas Edward Thorpe, on four papers 'Argon, a new constituent of the atmosphere' by John William Strutt, 3rd Baron Rayleigh and William Ramsay, 'The liquefaction and solidification of argon' by K Olszewski, 'On the spectra of argon' by William Crookes, 'On the spark spectrum of argon as it appears in the spark spectrum of air' by Walter Noel Hartley, and a letter from George Francis Fitzgerald to John William Strutt, 3rd Baron Rayleigh First paper: Recommended for publication in the 'Philosophical Transactions of the Royal Society'. Subject: Physics and Chemistry [Published in the Philosophical Transactions of the Royal Society, 1895] Second paper: Recommended for publication in the 'Philosophical Transactions of the Royal Society'. Subject: Physics and Chemistry [Published in the Philosophical Transactions of the Royal Society, 1895] Third paper: Recommended for publication in the 'Philosophical Transactions of the Royal Society'. Subject: Physics and Chemistry [Published in the Philosophical Transactions of the Royal Society, 1895] Fourth paper: Recommended for publication in the Proceedings of the Royal Society of London. Suggests the author apply the corrections to which he refers. Subject: Physics and Chemistry [Published in the 'Proceedings of the Royal Society of London', 1895] Letter from George Francis Fitzgerald to John William Strutt, 3rd Baron Rayleigh. If the theory raised requires further publicity, a full report could be printed in the Chemical News, or as a footnote to the paper by John William Strutt, 3rd Baron Rayleigh and William Ramsay. 13 February 1895