Second referee's report by James Clerk Maxwell, on a paper 'On spectra of electric of light, as modified by the nature of the electrodes and the media of discharge' by Thomas Romney Robinson No clear statement regarding publication in the 'Philosophical Transactions of the Royal Society'. The paper continues and concludes the researches earlier reviewed [RR/5/218]. Suggests adding some history of some of the observed lines. The paper shows the importance of careful observation and study of particular lines. Refers to work by John Tyndall. Cannot conceive how a molecule might have its own temperature. Subject: Physics and Chemistry [Published in the Philosophical Transactions of the Royal Society, 1862] 10 September 1862