CHEMICAL INDUSTRIES EXPOSITION PREPARES LECTURE SERIES The Management of the Twelfth Exposition of Chemical Industries, which will be held in the Grand Central Palace, New York, during the week of May 6, 1929, announce that they are arranging for a series of lectures upon chemical engineering, apparatus, instruments, and chemical products applied in the arts. These lectures will be prepared by members of the staffs of exhibitors in the exposition and will be available for presentation in educational institutions throughout the country. This course of lectures will in some measure be an extension of the Students' Course \*.t.ich is a regular feature of each Exposition and will now for the first time become available to colleges and technical schools which desire to avail themselves of an opportunity to have their advanced students hear discussions by authorities upon the vario~is subjects Among the lectures already arranged for are: "Multiple Effect Evaporation and Solvent Extraction," by H. Austin, Ernest Scott & Company; "Drying and Distillation," by R . W. MacGregor, Ernest Scott & Company; "Continuous Thickening and Countercurrent Washing and Chemical Industries," by A. Anable, The Dorr Company; "Dryers of the High Temperature Type," by S. Gertz, C. 0 . Bartlett 8 Snow Co.; "Duriron Equipment," E. A. Suverkrop, The Duriron Company, Inc.; "Thermal Conductivity Gas Analysis and Control in Chemical Process Work," by W. 0. Hebler, Charles Engelhaid, Inc.; "Water-, Acid-, Alkali-, and Oil-Proofing Concrete Construction," by M. W. Meyer, Anti-Hydro Waterproofing Co.; "Protecting Concrete Floors and Tanks against Action by Acids, Alkalis and Oils," by M. W. Meyer, AntiHydro Waterproofing Co.; "Principles of Pyrometry; Instruments in Industry and the Power Plant for the Measurement of Temperature and Flow," by C. H. Kerr, B r o w Instrument Company; "Use of Diatomaceous Silica in Filtration Processes," illustrates the theory of filtration and clarification methods in industrial processes, by E. A. Phoenix, Celite Products Company; "Workability in Concrete with Particular Reference to the Use of Diatomaceous Silica," designed for Civil Engineering Students by E. A. Phoenix, Celite Products Company; "High Temperature Insulation," discusses subject of heat transmission and calculation losses through walls, interesting to chemical and mechanical engineering students, by E. A. Phoenix, Celite Products Company. Colleges, Schools, and Educational Institutions seeking to take advantage of this lecture series may address Charles F. Roth, Manager of the Exposition with oficcs a t Grand Central Palace. Some of the lecturers will be available in certain localities and others for convenience when upon travel tours.
Chemical Treatment Saves Ancient Manuscript. The aid of ultra-modern chemistry has been invoked t o salvage another relic of the remote past. An ancient leather roll of Egyptian writing had lain unopened for TXI years in the British Museum because i t was so brittle that no one dared unroll it. Experiments with a broken fragment of the leather in the museum's laboratory, however. finally gave scientists a clue as to h o . t~o handle the mysterious manuscript. Several thin coatings of celluloid were soaked into the pores of the leather, after which it was cemented with strong celluloid onto a piece of celluloid-treated cheesecloth. I n this way it was unrolled witnout a break and pressed flat between two glass plates to dry. It remained perfectly flat alter dryinp, and can now be read with ease.Science Senrzce
