Paper, 'On line spectra of boron and silicon' by W N [Walter Noel] Hartley Hartley writes: 'In the course of an extended examination of all varieties of saline solutions by means of the spark and a photographic camera, I have observed two spectra of much interest. I detach my notes from the paper in which they are embodied in order to give them an earlier publication.' Annotations in pencil and ink. Subject: Chemistry Received 28 May 1883. Read 21 June 1883. Communicated by George Gabriel Stokes. A version of this paper was published in volume 35 of the Proceedings of the Royal Society as 'On line spectra of boron and silicon'. 1883