Contents. 
28. A Simple Dynamic Method for determining Vapour Pressures. By Alexander 
Smith and Alan W. C. Menzies. (Abstract.) Issued separately June 16, 1910, 
29. Equilibrium in the Ternary System : Water, Potassium carbonate, Potassium ethyl 
di-propyl-malonate. By J. W. M‘David, B.Sc., Carnegie Besearch Scholar. 
Communicated by Professor James Walker. Issued separately July 14, 1910, . 
30. On a New Method for differentiating between overlapping Orders when mapping 
Grating Spectra. By Alexander D. Ross, M.A., B.Sc., Assistant to the Pro- 
fessor of Natural Philosophy in the University of Glasgow. Issued separately 
July 28, 1910, ......... 
31. On Two Relations in Magnetism. By R. A. Houstoun, M.A., D.Sc., Ph.D., 
Lecturer in Physical Optics in the University of Glasgow. Communicated by 
Professor A. Gray, F.R.S. Issued separately July 28, 1910, 
32. Observations of the Earth-Air Electric Current and the Atmospheric Potential 
Gradient at Edinburgh. By G. A. Carse, D.Sc., and D. MacOwan. Issued 
separately July 28, 1910, 
33. On Continuous, and Stable, Isothermal Change of State. By Professor W. 
Peddie. Issued separately July 28, 1910, ..... 
34. The Significance of the Correlation Coefficient when applied to Mendelian Dis- 
tributions. By John Brownlee, M.D., D.Sc. Issued separately August 1, 1910, 
35. The Morphology of the Manus in Platanista gangetica , the Dolphin of the Ganges. 
By Sir William Turner, K.C.B., D.C.L., F.R.S. , President of the Society. 
(With Four Plates.) Issued separately August 1, 1910, 
36. Specific Volume of Solutions of Tetra- propyl-ammonium Chloride. By J. W. 
M‘David, B.Sc., Carnegie Research Scholar. Communicated by Professor 
James Walker. Issued separately September 7, 1910, .... 
37. The Vapour Pressures of Mercury. By Alexander Smith and Alan W. C. 
Menzies. Issued separately September 7, 1910, 
38. A Static Method for determining the Vapour Pressures of Solids and Liquids. 
By Alexander Smith and Alan W. C. Menzies. Issued separately September 
7, 1910, .......... 
39. Did the Tail of Halley’s Comet affect the Earth’s Atmosphere? By Dr John 
Aitken, F.R.S. Issued separately September 7, 1910, .... 
40. A Stereoscopic Illusion. By Professor Francis Gibson Baily, M.A. Issued 
separately October 12, 1910, ....... 
41. The Efficiency of Metallic Filament Lamps. By R. A. Houstoun, M.A., D.Sc., 
Ph.D., Lecturer in Physical Optics in the University of Glasgow. Communicated 
by Professor A. Gray, F.R.S. Issued separately December 16, 1910, . 
42. On the Precipitation of Soluble Chlorides by Hydrochloric Acid. By John 
Gibson, Ph.D., and R. B. Denison, D.Sc., Ph.D. Issued separately December 
23, 1910, .......... 
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Obituary Notice, 
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