VOL. 5. NO. 6
PROGRAM OR PAPERS,SIXTECOLLOID SYMPOSIUM
755
PROGRAM OF PAPERS, SIXTH COLLOID SYMPOSIUM University of Toronto, June 14, 15, 16, 1928 1. Sir William B. Hardy, Cambridge, England. (Title not yet received.) 2. Dr. H. A. Abramson, "Cataphoresis of Blood Cdls and Inert Particles in Sols and Gels and Its Biological Significance" (with motion pictures). 3. Wilder D. Bancroft and C. E. Barnett, Cornell University, "Adsorption of Methylene Blue by Lead Sulfate." 4. David R. Briggs, University of Minnesota, "Surface Conductance." 5. E. F. Burton and Beatrice Reid Deacon, University of Toronto, "Influence of Temperature on Coagulation of Colloidal Solutions." 6. John R. Fanselow, University of Wisconsin, "The Influence of Electrolytes and Non-Electrolytes upon the Optical Activity and Relative Resistance to Shear of Gelatin Systems." 7. William D. Harkins, University of Chicago, "Charges on Colloidal Particles, Adsorption, and the Spreading of Liquids." 8. A. B. Hastings, University of Chicago, "The Rble of Hemoglobin in the Blood." 9. Ernst Hauser, Frankfurt am Main, Germany, "New Microsopic Methods in Connection with the Problem of Vulcanization." 10. Emil Heuser, International Paper Company, Ontario. "Problems of Cellulose Chemistry." 11. Harry N. Holmes and Robert C. Williams, Oberlin College, "The Uniform Distribution of Catalysts throughout Porous Solids." 12. F. B. Kondrick, University of Toronto, "The Effect of Adsorbed Water on Electrical Conductivity of Powders." 13. John C. Krantz and Neil E. Gordon, University of Maryland, "Hydrogen-Ion Concentration and Stability of Emulsions." 14. M. E. Laing, J. W. McBain, and E. W. Harrison, Stanford University, "Adsorption of Sodium Oleate at the Air-Water Interface." 15. J. W. McBain, W. F. K. Wynne-Jones, and F. H. Pollard, Stanford University, "The Activity and Adsorption of @-Toluidinein the Surface of Its Aqueous Solutions." 16. P. J. Moloney and Edith M. Taylor, Connaught Research Laboratories, "Fractionation of Diptheria Anti-Toxic Sera." 17. Stuart Mudd, Baludin Lucke, Morton McCutcheon, and Max Strumia, University of Pennsylvania, "Relation between Surface Properties and Phagocytosis of Bacteria." 18. H. A. Neville and H. C. Jones, Lehigh University, "The Study of Hydration Changes by a Volume-Change Method." 19. J. B. Nichols, du Pont Company, "The Development of the Ultracentrifuge and Its Field of Research." 20. Fred Olsen, Picatinny Arsenal, "Influence of Gel Structure upon the Technology of Smokeless Powder Manufacture." 21. A. 1.Phillins. . . Picatinnv Arsenal. "Structure of Cellulose Nitrate and Cellulose Nitrate Gels." 22. W. L. Robinson. Universitv of Toronto. "The Filtration of Colloids bv the Spleen." 23. S. E. Sheppardand R. H. Lambert, Ea.;tman Kodak Company, "Grain Growth in Silver Bromide Precipitates." 24. A. J. Stimm, Forest Products Laboratories, "The Structure of Softwoods as Revealed by Dynamic Physical Methods." 25. H. L. Trumbull, B. F. Goodrich Company. "The Preparation and Properties of Rubber Dispersions."
26. Hardol~hWastenevs and H. Borsook. Universitv of ~ o r o i t o ."Emulsions and Protein Synthesis." 27. Harm B. Weiser and G. E. Cunningham, The Rice Institute, "Adsorption of Ions and the Physical Character of Precipitates" (with motion pictures). 28. G. S. Whithy, J. G. McNally, and W. Gallay, McGill University, "Studies of Organophilic Colloids."
A NOTE ON REMOVING "FROZEN" GLASS STOPPERS JAMES
C. Rlcs,
JUNIOR
COLLEGE, KANSASCITY, MISSOURI
T h e forehanded teacher of chemistry always remembers to e m p t y glassstoppered bottles when h e closes t h e laboratory f o r the summer. To such teachers t h i s note does not apply. For those who, like t h e writer, sometimes fail to do t h i s t h e following suggestion may prove valuable. The stoppers of reagent bottles, particularly those containing sodium hydroxide, often freeze, especially during the summer vacation. I f t h e bottle chances to contain a small a m o u n t of the solution t h e stopper c a n sometimes be removed by inverting a n d so causing the contents to a c t as solvent. The writer makes it a practice to collect bottles with frozen stoppers at t h e beginning of school i n t h e fall. H e inverts these bottles and perm i t s t h e solution t o exert i t s solvent action on t h e frozen stoppers for a b o u t a week. T h e method is successful i n a b o u t two-thirds of the cases. In those cases in which it fails o t h e r methods are equally futile. In as m u c h as t h e
process is one involving "mass production" it has proved a valuable laborat o r y aid. E v e n so hopeless a case as a bottle containing sodium bisuKte of two years' standing proved amenable to t h e method.
German Process Separates Oil by Electricity. A process for getting oil out of steam condensation water has been developed by Fritz Hoyer, a German scientist. I t is expected to replace the mechanical methods for removing the troublesome residue of oil now in use. Most of the oil which is used for lubricating steam pistons and gearing is atomized and carried away in the waste steam. As a result of this a very stable milky emulsion is farmed on the condensed water, and the problem of separation of oil and water is an extremely difficult one. Many mechanical oil separators have been tried, but up to the present they have not been an unqualified success, and when the condensed water which has passed through them is used for the boiler appreciable quantities of oil also pass in. This oil combines with the boiler scale to form a solid mass which settles on the walls of the boilers and tends to cause overheating of the plates. In the Hoyer process a direct current is passed through the water, which collects the ail in small foam flakes, thus destroying the emulsion and making filtration possible. The consumption of electricity is about one kilowatt hour for five cubic meters of water. -Science Service
