Referee's report by George Carey Foster, on a paper 'Researches on the action of organic substances on the ultra-violet rays of the spectrum. Part III. On examination of essential oils' by Walter Noel Hartley and A K Huntington Recommended for publication in the 'Philosophical Transactions of the Royal Society'. The diagrams could not be conveniently given in the Proceedings. Subject: Physics and Chemistry [Published in the 'Proceedings of the Royal Society of London', 1879] 2 March 1880