1176 Proceedings of Royal Society of Edinburgh. [sess. 
TWELFTH ORDINARY MEETING. 
Monday , 1 6th May 1904. 
Sir John Murray, K.C.B., Vice-President, in the Chair. 
Dr Erskine Beveridge, Mr W. Muirhead Baxter, and Mr 
James Robert Milne were admitted Fellows of the Society. 
The following Communication was read : — 
A Cosmic Theory of the Diurnal and Long-Periodic Changes of 
Terrestrial Magnetism and their possible Connection with Seismic 
Phenomena and the Displacements of the Earth’s Axis of Rotation. By 
Dr J. Halm, Assistant Astronomer, Royal Observatory, Edinburgh. 
Communicated by the Astronomer-Royal for Scotland. ( With 
Lantern Illustrations.) 
THIRTEENTH ORDINARY MEETING. 
Monday , 6th June 1904. 
The Rev. Professor Duns, Vice-President, in the Chair. 
The following Communications were read : — 
1. Obituary Notice of Dr Charles Catty. By Professor W. C. 
M‘Intosh, F.R.S. pp. 1228-1234. 
2. On the Measurement of Stress by Thermal Methods : an Account 
of some Experiments on the Influence of Stress on the Thermal 
Expansion of Metals. By E. G. Coker, M.A., D.Sc., Assistant Professor 
of Civil Engineering, M‘Gill University, Montreal. Trans., vol. 41, pp. 
229-250. 
3. On the Spectrum of Nova Persei and the Structure of its Bands, 
as photographed at Glasgow. By Professor L. Becker. Trans., vol. 
41, pp. 251-290. 
4. Note on Astronomical Seeing. By Dr J. Halm, Assistant 
Astronomer, Royal Observatory, Edinburgh. Communicated by 'the 
. Astronomer-Royal for Scotland, pp. 458-462. 
Dr Donald James Mackintosh and Mr William Macdonald 
were balloted for, and declared duly elected Fellows of the Society. 
