As some of my readers may wish to pursue the study of lightning and lightning conductors beyond the limits to which a popular lecture must, of necessity, be confined, I subjoin a list of the books which I think they would be likely to find most useful for the purpose. Among ordinary text-books on physics--Jamin, Cours de Physique, vol. i., pp. 470-494; Mascart, Traité d’Electricité Statique, vol. ii., pp. 555-579; De Larive, A Treatise on Electricity, in three volumes, London, 1853-8, vol. iii., pp. 90-201; Daguin, Traité de Physique, vol. iii., pp. 209-280; Riess, Die Lehre von der Reibungs-Elektricität, vol. ii., pp. 494-564; Müller-Pouillet, Lehrbuch der Physik, Braunschweig, 1881, vol. iii., pp. 210-225; Scott, Elementary Meteorology, chap. x. Of the numerous special treatises and detached papers on the subject, I would recommend Instruction sur les Paratonnerres adopté par l’Académie des Sciences, Part i., 1823, Part ii., 1854, Part iii., 1867, Paris, 1874; Arago, Sur le Tonnerre, Paris, 1837; also his Meteorological Essays, translated by Sabine, London, 1855; Sir William Snow Harris, On the Nature of Thunderstorms, London, 1843; also by the same writer, A Treatise on Frictional Electricity, London, 1867; and various papers on lightning conductors, from 1822 to 1859; Tomlinson, The Thunderstorm, London, 1877; Anderson, Lightning Conductors, London, 1880; Holtz, Ueber die Theorie, die Anlage, und die Prüfung der Blitzableiter, Greifswald, 1878; Weber, Berichte über Blitzschläge in der Provinz Schleswig-Holstein, Kiel, 1880-1; Tait, A Lecture on Thunderstorms, delivered in the City Hall, Glasgow, in 1880, Nature, vol. xxii.; Report of the Lightning Rod Conference, London, 1882. This last-mentioned volume comes to us with very high authority, representing, as it does, the joint labors of several eminent scientific men selected from the following societies: The Meteorological Society, the Royal Institute of British Architects, the Society of Telegraph Engineers and Electricians, the Physical Society. Since the above was in print, two lectures given before the Society of Arts by Professor Oliver Lodge, F. R. S., have appeared in the _Electrician_, June and July, 1888, in which some new views are put forward respecting lightning conductors, that seem deserving of careful consideration. FOOTNOTES: [17] The Thunderstorm, by Charles Tomlinson, F. R. S., Third Edition, pp. 153-4. [18] Two Lectures on Atmospheric Electricity and Protection from Lightning, published at the end of his Treatise on Frictional Electricity, p. 273. [19] See Report of Lightning Rod Conference, p. 119. [20] _Loco citato._ [21] Sir William Snow Harris, _loco citato_, p. 274. [22] _Id._, p. 275. [23] The Thunderstorm, by Charles Tomlinson, F.R.S., Third Edition, p. 172. [24] See for these facts, Anderson, Lightning Conductors, p. 197; Tomlinson, The Thunderstorm, pp. 167-9; Harris, _loco citato_, pp. 273-4.