Paper, 'The conditions of the formation and decomposition of nitrous acid' by Victor Herbert Veley Veley writes: 'Throughout the whole science of chemistry there is possibly no reagent so frequently represented as taking part in various trans­formations, but of which so little definite is known, as nitrous acid. In many text-books its properties are cursorily discussed in a few lines, while some writers have gone so far as to deny its existence altogether even in the presence of nitric acid.' Annotations in pencil and ink. Subject: Chemistry Received 12 April 1892. Read 2 June 1892. Communicated by William Odling. A version of this paper was published in volume 52 of the Proceedings of the Royal Society as 'The conditions of the formation and decomposition of nitrous acid'. 1892