VI 
Contents. 
The Systematic Motions of the Stars. By Professor Dyson. Issued separately 
April 9, 1908, 
On a Sensitive State induced in Magnetic Materials by Thermal Treatment. By 
James G. Gray, B.Sc., Lecturer on Physics in the University of Glasgow, and 
Alexander D. Ross, M.A., B.Sc., Assistant to the Professor of Natural 
Philosophy in the University of Glasgow. Communicated by Professor A. Gray, 
F.R.S. Issued separately April 10, 1908, ...... 
On a Test for Continuity. By W. H. Young, Sc.D., F.R.S. Communicated by J. H. 
Maclagan Wedderburn. Issued separately April 10, 1908, 
The Problem of a Spherical Gaseous Nebula. By Lord Kelvin. Issued separately 
May 6, 1908, ......... 
The Theory of Skew Determinants in the Historical Order of Development up to 
1865. By Thomas Muir, LL.D. Issued separately May 13, 1908, 
Sunset and Twilight Curves, and Related Phenomena. By D. M. Y. Sommerville. 
Communicated by Professor Dyson. (With Three Plates.) Issued separately 
May 14, 1908, ......... 
A Preliminary Notice of Five New Species of Iron-Bacteria. By David Ellis, Pli.D. 
(Marburg), D.Sc. (London), F.R.S.E., Lecturer in Botany and Bacteriology, 
Glasgow and West of Scotland Technical College, Glasgow. (With Three 
Plates.) Issued separately June 13, 1908, ...... 
The Arterial Pressure in Man. I. : Methods. By G. A. Gibson, M.D., D.Sc., LL.D., 
F.R.C.P.Ed. Issued separately June 22, 1908, ..... 
Preliminary Statement on the Morphology of the Cone of Lycopodium cernuum and 
its bearing on the affinities of Spencerites. By William H. Lang, M.B., D.Sc., 
Lecturer in Botany, Glasgow University. Communicated by Professor F. O. 
Bower, Sc.D., F.R.S.L. and E. Issued separately June 22, 1908, 
Note on the Electrical Resistance of Spark Gaps. By Robert A. Houstoun, Ph.D., 
D.Sc. Communicated by Professor A. Gray, F.R.S. Issuer! separately July 20, 
1908, .......... 
On the Cohesion of Steel, and on the Relation between the Yield Points in Tension 
and in Compression. By G. H. Gulliver, B.Sc., A.M.I.Mech.E., Lecturer in 
Engineering in the University of Edinburgh. Issued separately July 20, 1908, 
The Electromotive Force of Iodine Concentration Cells in Water and Alcohol. By 
A. P. Laurie, M.A., D.Sc., Principal of the Heriot-Watt College, Edinburgh. 
Issued separately July 22, 1908, ....... 
Inversion Temperatures, and the Form of the Equation of State. By Professor W. 
Peddie. Issued separately July 22, 1908, ...... 
Treatment of Aneurysm by Electrolysis. By Dr Dawson Turner. Issued separately 
July 23, 1908, ......... 
Experiments with Heusler’s Magnetic Alloy. By James G. Gray, B.Sc., Lecturer on 
Physics in the University of Glasgow. Communicated by Professor A. Gray, 
F.R.S. Issued separately July 23, 1908, ...... 
The Theory of Hessians in the Historical Order of Development up to 1860. By 
Thomas Muir, LL.D. Issued separately July 23, 1908, .... 
PAGE 
231 
239 
249 
259 . 
303 
311 
338 
343 
356 
369 
374 
382 
394 
400 
403 
413 
