Die Herstellung Grosser Glaskoerper and Die Bearbeitung Grosser Glaskoerper. By C. Wetzel. (Hartleben’s Verlag, Vienna and Leipzig, 1900 and 1901 respectively.) Describes numerous special processes and appliances devised for use in connection with large glass objects. Some of these descriptions, however, appear to be little more than transcripts from patent specifications. Glasfabriken und Hohlglasfabrikation. By R. Dralle. (Leipzig, Baumgaertner, 1886.) Looked upon as a classic in Germany. Gives detailed plans and drawings of entire bottle-works, including furnaces and all accessories. Deals principally with bottle manufacture. Die Glasfabrikation. By Dr. E. Tscheuschner. (Weimar, B. H. Voigt, 1888.) A full detailed account of all processes known at the time. The rapid progress of modern practice has, however, already rendered this book to some extent obsolete. Jenaer Glas. By Hovestadt. Already referred to in respect of the English translation. Der Sprechsaal. (Schmidt, Weimar.) A trade journal devoted to the discussion of technical matters relating to the glass and ceramic industries. Occasionally contains articles and abstracts of technical or scientific interest in connection with glass manufacture. * * * * * In addition to the books and papers named in the above list, a great number of scientific papers, notes, etc., are to be found scattered throughout the technical and scientific publications of the world; those that have proved of real interest and importance have, however, left their mark on the industry, and will be found described or referred to in connection with the various branches of manufacture described in the present volume or in the books named above. INDEX A. Abbé, 8, 10, 210, 218 Absorption of light in glass, 32, 179 Acid, action of, on glass, 11 boric, action of, on glass, 11, 186 carbonic, action of, on glass, 12 hydrofluoric, action of, on glass, 12 phosphoric, action of, on glass, 11 Air, compressed, 91, 105, 117 Alkali chlorides, use of, in glass manufacture, 41 content of hygroscopic glass, 6 metals, 184 nitrates, 44, 78 sources of, 40 Alkaline liquids, action of, on glass, 11 Aluminium, 51, 186 Ammonia soda, 41 Anastigmatic photographic lenses, 213 Ancient windows, colours of, 16, 202 Annealing bottles, 103 kiln, 103 for optical glass, 235 for plate glass, 135 for rolled plate glass, 127 Anthracite coal, 42, 53, 79 Antimony, 188 Apochromatic objectives, 213 Arsenic, 52, 78, 105, 117, 188 Artificial gems, 246 Auerbach, 22 Aventurine, 185 B. Bacteria, action of, on glass, 13 Barium compounds, 47, 186 crown glass, 212 glass, 7 Barytes, 48 Bases other than alkalies, sources of, 45 Beads, 244 Behaviour, chemical, of glass, 6 Bending plate glass, 144 Bevelling, 145 Black ash, 41 Blisters in sheet glass, 160, 168