430 Proceedings of Royal Society of Edinburgh. [sess. 
3. A new Form of Myograph, and its Uses. By S. C. Mahalanobis, 
B.Sc., F.R.M.S., F.R.S.E., Assistant Lecturer on Physiology, University 
College, Cardiff, pp. 62-67. 
4. On Swan’s Prism Photometer, commonly called Lummer and Brod- 
hun’s Photometer. By Dr C. G. Knott, pp. 12-14. 
5. On the Claim recently made for Gauss to the Invention (not the 
Discovery ) of Quaternions. By Professor Tait. pp. 17-23. 
6. Professor Klein’s View of the Nature of a Quaternion. By Dr C . 
G. Knott, pp. 24-34. 
THIRD ORDINARY MEETING. 
Monday , 8th January "1 900. 
Sir William Turner, LL.D., D.C.L., Vice-President, in the Chair. 
Mr Alfred C. Wilson was admitted a Fellow of the Society. 
The following Communications were read : — 
1. Two Historical Fallacies : — Heather Beer, and Uisge Beithe. By 
Dr W. Craig Maclagan. Trans ., vol. 40, pp. 15-22. 
2. On the Thermo-electric Properties of Solid and Liquid Mercury. 
By Dr W. Peddie and Mr A. B. Shand. p. 15. 
3. On the Azores Bank, and some recent Deep-sea Soundings in the 
North Atlantic. By A. E. Peake, Esq., M.Inst.C.E., and Sir John 
Murray, K.C.B. 
4. The Examination of Sea-Water by an Optical Method. By John 
J. Manley, Esq. Communicated by Sir John Murray, K.C.B. pp. 
35-43. 
FOURTH ORDINARY MEETING. 
Monday, %%nd January 1900. 
The Rev. Prof. Duns, D.D., Vice-President, in the Chair. 
The following Communications were read : — 
1. The Torsional Constants of Iron and Steel. By Dr W. Peddie. 
p. 16. 
2. Simple Proof of Gibbs’ Phase-Rule. By Professor Kuenen, 
University College, Dundee, pp. 317-318. 
3. Change of the Coefficient of Absorption of a Gas in a Liquid with 
Temperature. By the Same. pp. 312-316. 
4. On the “ Cosmosphere,” an instrument for exhibiting Astronomical 
and Navigational Problems in a concrete form : — and on a Slide-Rule for 
solving, by inspection, Astronomical and Navigational Problems. By 
Walter B. Blaikie, Esq. 
