588 Proceedings of Royal Society of Edinburgh. [sess. 
2. Does the Spectrum-place of the Sodium Lines vary in different 
Azimuths? By the. late Professor C. Piazzi Smyth, Astronomer-Royal 
for Scotland. Communicated by Prof. J. G. MacGregor, pp. 225-232. 
Dr Nicholas Senn, Professor of Surgery, Rush Medical 
College, Chicago, U.S.A., Dr W. B. Bannerman, Major, Indian 
Medical Service, Mr Andrew Fuller Hargreaves, F.C.S., and 
Dr Charles Du Riche Preller, Assoc. Memb. Inst, C.E., were 
balloted for, and declared duly elected Fellows of the Society. 
TWELFTH ORDINARY MEETING. 
Monday , 19 th May 1902. 
The Rev. Professor Duns, D.D., Vice-President, in the Chair. 
Lieut. *Col. Joshua Nunn, Army Veterinary Department, and 
Major W. B. Bannerman, Indian Medical Service, were admitted 
Fellows of the Society. 
The following Communications were read : — 
1. Note on the Meteorological Conditions accompanying “ Fohn” and 
Up-Bank Thaws in Glen Nevis. By R. C. Mossman, Esq. 
2. Reduction of the Edinburgh Meteorological Observations to 1900. 
By the same. Trans., vol. 40, pp. 469-509. 
3. The Influence of Varying Temperature and Pressure on the Vapor 
Density of Calomel Vapor. By Professor Alex. Smith, B.Sc., Ph.D. 
4. Vanishing Aggregates of Secondary Minors of a Persymmetric 
Determinant. By Thomas Muir, Esq., LL.D. Trans., vol. 40, pp. 511- 
533. 
5. The Theory of Orthogonants in the Historical Order of its Develop- 
ment up to 1854. By the same. pp. 244-288. 
THIRTEENTH ORDINARY MEETING. 
Monday, 2nd June 1902. 
Dr R. M. Ferguson in the Chair. 
The following Communications were read : — 
L Some Identities connected with Alternants and with Elliptic 
Functions. By Professor W. H. Metzler. pp. 240-243. 
