Papers of Sir James Dewar include: (DI-DII) correspondence and general papers relating to membership of institutions, scientific work and the views of individuals, written papers. (DIII) Biographical papers and cuttings 1911-1925 and personal and (DB11) biographical papers c.1891-1924, relate to Dewar and his work. (DIII) Photographs 1890-1894, relate to various aspects such as rooms in the Royal Institution of Great Britain (RI) and apparatus; (DE15) photographs and reprints including discourses 1875-1923 include an album of photographs of soap films, reprints of Dewar lectures at the RI, notes on courses and lectures by Dewar and others such as John Tyndall. Notebooks relate to (DIII) experimental observations 1907-1909; (DB4) notebooks on radiation, dissociation, analyses; (DB5) low temperature work 1874-1919, notebooks and other papers; (DB6) spectroscopy notebooks 1879-1912; (DB7) rare gases 1885-1923, notebooks and papers; (DB8) laboratory apparatus notebooks, 1881-1905; (DB9) notebooks and papers on bubbles, 1917-1923; (DB10) notebooks on the work of Marcellin Berthelot and Henri Moissan, 1907; (DE10) lecture notebooks and experimental notes 1869-1918, relate to topics such as hydrogen, thermal values, latent heat and decomposition of gases. Notes on lectures include (DIV) lecture notes and lists 1878-1891, relates to soap bubbles, and Christmas lectures at the RI; (DB3) lecture notes 1877-1906, relates to lectures at the RI; (DE16) lecture notes and correspondence 1885-1940, relates to lectures at the RI including Christmas lectures and correspondence of various recipients particularly with William J. Green. (DE14) Discourses 1894-1923, relate to the Friday Evening Discourses at the RI as well as other notes on experiments. Various forms of notes include: (DB1) general laboratory notes 1864-1923, on temperature, thermo electric properties, analysis of water; (DB2) sound experiments; (DV) notes on scientists and scientific work 1845-1903, relate to Dewar; (DE1) experimental notes 1904-1922 and (DE2) 1919-1923, relate to topics such as dielectric constants of liquid hydrogen, soap films, vacuum tubes, radium, low temperature and radiation from the sky; (DE3) laboratory notes 1897-1930, (DE4) 1914-1920, (DE7) pre-1900 and (DE8) 1875-1910, relate to topics such as silvered vacuum flasks, specific heats, diffusion, apparatus, charcoal absorption and spectroscopic examination of gases; (DE5) bubble measurements 1815-1822, notes and observations; (DE13) experimental notes and correspondence 1893-1922, relate to topics such as densities at low temperature, charcoal, soap film and gases; (DE6) miscellaneous experimental notes 1878-1922 and (DE9) miscellaneous notes 1871-1925, relate to topics such as critical temperature of gases, radiation curves and bubbles. (DE11) Reprints 1866-1913, relate to issues such as Friday Evening Discourses at the RI, the Michael Faraday Centenary of 1891, Christmas lectures at the RI and notes and reports on experiments. (DE12) Royal Institution 1885-1924, relates to messages and letters to, from or concerning Dewar, his role at the RI and general administrative issues. (DE17) Diplomas, drawings and graphs relate to Dewar's Fullerian Professorship at the RI, apparatus and experiments. (DG1-DG3) W. J. Green papers include correspondence, notes, photographs and notebooks on experimental discussions and personal issues such as health. (DCI) Scott controversy 1911, Gordon case 1912-1917, (DCII) early Scott case 1891-1892 and Ruhemann controversy 1890-1891, correspondence and papers. (DVI) J. E. Petavel papers - St Louis exhibition 1904, relates to the reproduction of Dewar's low temperature work for the exhibition with notes on the exhibition. (DVII) War work 1915-1918, includes letter and papers on work for the war effort, World War One.