Contents. 
24. On the Temperature Coefficient of Concentration Cells, in which the same salt 
is dissolved in two different solvents. By A. P. Laurie, M.A , D.Sc. Issued 
separately April 25, 1911, 
25. The Topography of the Cerebral Cortex of the Guinea-pig. By Williamina 
Abel, M.D., McCunn Scholar. Communicated by Professor D. Noel Paton. 
Issued separately May 12, 1911,. ...... 
26. On the Accuracy attainable with a Modified Form of Atwood's Machine. By 
John P. Dalton, M.A., B.Sc., Carnegie Research Fellow. Communicated by 
Professor W. Peddie. Issued separately May 15, 1911, 
27. The Dissipation of Energy in Torsionally Oscillating Wires of Brass and other 
Materials, with the Effects produced on the Laws of Torsional Oscillation by 
Change of Temperature, etc. By J. B. Ritchie, B.Sc., Carnegie Research 
Scholar in Physics, University College, Dundee. Communicated by Professor 
W. Peddie. Issued separately May 16, 1911, ..... 
28. An Apparatus for inducing Fatigue in Wires by means of repeated Extensional 
and Rotational Strains, with the Effects produced by such Fatigue on the 
Laws of Torsional Oscillation. By J. B. Ritchie, B.Sc., Carnegie Research 
Scholar in Physics, University College, Dundee. Communicated by Professor 
W. Peddie. Issued separately May 16, 1911, . 
29. Boole’s Unisignant. By Thomas Muir, LL.D. Issued separately May 17, 1911, 
30. Isopiestic Expansibility of Water at High Pressures and Temperatures. By W. 
Watson, M.A., B.Sc. ; 1851 Exhibition Research Scholar, 1909-1910. Com- 
municated by Professor J. G. MacGregor. Issued separately May 18, 1911, 
31. On some Nuclei of Cloudy Condensation. — Part II. By John Aitken, F.R.S. 
Part I. in Transactions. Issued separately July 6, 1911, 
32. On the New Genus of Iron-bacteria, Spirophyllum ferrugineum (Ellis). (A reply 
to criticism.) By Dr David Ellis, Lecturer in Botany and Bacteriology, 
Glasgow, and West of Scotland Technical College, Glasgow. (With Two 
Plates.) Issued separately July 7, 1911, . . . . . 
33. On the Influence of Temperature upon the Magnetic Properties of a Graded 
Series of Carbon Steels. By Margaret B. Moir, M.A., B.Sc., Carnegie 
Research Scholar in the University of Glasgow. Communicated by Professor 
A. Gray, F.R.S. Issued separately July 7, 1911, .... 
34. Laboratory Note : A Simple Method of finding the Radius of Gyration of a 
Body. By W. G. Robson, A.R.C.S. Communicated by Professor W. Peddie. 
Issued separately July 7, 191 1, ....... 
35. The Vapour Pressure of Dry Calomel. By Alexander Smith and Alan W. C. 
Menzies. (Abstract.) Issued separately July 7, 1911, 
36. The Absorption of Light by Inorganic Salts. No. I. : Aqueous Solutions of 
Cobalt Salts in the Infra-Red. By R. A. Houstoun, M.A., Ph.D., D.Sc., 
Lecturer on Physical Optics in the University of Glasgow. Communicated by 
Professor A. Gray, F.R.S. Issued separately July 8, 1911, 
37. The Absorption of Light by Inorganic Salts. No. II. : Aqueous Solutions of 
Cobalt Salts in the Visible Spectrum. By R. A. Houstoun, M.A., Ph.D., 
D.Sc., Lecturer on Physical Optics, and Alex. R. Brown, M.A., Thomson 
Experimental Scholar in the University of Glasgow. Communicated by Pro- 
fessor A. Gray, F.R.S. Issued separately July 8, 1911, 
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