IV 
CONTENTS. 
NO. PAGE 
XVII. On a Fuller Test of the Law of Torsional Oscillation. By 
James B. Ritchie, B.Sc., Carnegie Research Scholar in 
Physics, University College, Dundee. ( Communicated by 
Professor W. Peddie), . . . . .177 
(Issued separately April 23, 1913.) 
XVIII. On a Continued Investigation of the Application of the Law 
of Torsional Oscillation to Various Metals and Alloys. By 
James B. Ritchie, B.Sc., Carnegie Research Scholar in 
Physics, University College, Dundee. (Communicated by 
Professor W. Peddie), . . . . .183 
(Issued separately May 19, 1913.) 
XIX. Note on a Comparison of Records of Atmospheric Electric 
Potential at Two Stations in Edinburgh. By G. A. Carse 
and G. Shearer, Edinburgh University; and H. Jameson, 
Royal Observatory, Edinburgh, . . . .194 
(Issued separately May 19, 1913.) 
XX. Changes of Electrical Resistance accompanying Longitudinal 
and Transverse Magnetizations in Nickel. By Professor 
C. G. Knott, D.Sc., ...... 200 
(Issued separately May 19, 1913.) 
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