820 
Proceedings of Royal Society of Edinburgh. [sess. 
Monday , 17 tli June 1889. 
The Hon. Lord M‘Laren, Yice-President, in the Chair. 
The following Communications were read : — 
1. Obituary Notice of the late Dr Samuel Drew. By Dr Arthur 
Jackson, Sheffield. Communicated by T. Andrews, Esq., F.R.S. P. 
2. On the Behaviour of the Hydrates and Carbonates of the Alkali 
Metals, and of Barium, at High Temperatures, on the Properties of 
Lithia, and the Atomic Weight of Lithium. By Professor Dittmar. T. 
xxxv. 429. 
3. On the Hydrokinetic Equations. By Professor Tait. 
4. On an interesting Family of Glissettes. By Professor Tait. 
5. A Revision of the Genus Goscinodiscus and some allied Genera. By 
John Rattray, Esq., M.A., B.Sc., F.R.S.E. P. xvi. 449. 
Monday , laf July 1889. 
John Murray, LL.D., Yice-President, in the Chair. 
The following Communications were read : — 
1. On the Determination of the Curve, on one of the Coordinate 
Planes, which forms the Outer Limit of the Positions of the Point of 
Contact of an Ellipsoid of Revolution which always touches the Three 
Planes of Reference. By Dr G. Plarr. Communicated by Professor 
Tait. T. xxxv. 471. 
2. On the Thermal Conductivity and the Specific Heat of Manganese 
Steel. By A. Crichton Mitchell, B.Sc. T. xxxv. 
3. On the Placentation of the Halicore Dugong. By Sir William 
Turner, F.R.S. P. xvi. 264 {Abstract)', T. xxxv. 641. 
4. Does the Coefficient of Absorption depend upon the Intensity of 
Light? By W. Peddie, D.Sc. 
5. On the Renal Organs of the Nematoidea.' By Dr A. B. Griffiths, 
F.C.S. 
The following Candidates were balloted for, and declared duly 
elected Fellows of the Society: — 
Professor T. D. Collis Barry, M.R.C.S.E., F.Z.S. 
Andrew E. Scougal, Esq., M.A. 
Monday , 15th July 1889. 
Professor Chrystal, Yice-President, in the Chair. 
The following Communications were read: — 
1. Theoretical Description of a New “Azimuth Diagram.” By 
Captain P. Weir. Communicated by the President. P. xvi. 354. 
With a Note by Professor Tait. P. xvi. 359. 
