/»£ $ 3-8 6 
PROCEEDINGS 
, OF THE 
ROYAL SOCIETY OF EDINBURGH. 
SESSION 1880 - 81 . 
CONTENTS. 
PAGE 
General Statutory Meeting , Monday , 22 d November 1880. 
Election of Office-Bearers, ..... 1 
Monday , 6th December 1880. 
Introductory Address by the President, the Bight Hon. 
Lord Moncreiff, ..... 2 
On the Structure of Fmplectella . By Dr F. E. Schultze. 
Communicated by Sir Wyville Thomson, . . 2 
On Eciuidifferent Multiples of Irrational Quantities. By Mr 
E. Sang, ...... 2 
Algebra of Relationship. Part IT. By A. Macfarlane, 
M.A., D.Sc., F.R.S.E., .... 5 
Monday, ‘lOth December 1880. 
On Dust, Fogs, and Clouds. By Mr John Aitken, . 14 
Solar Eclipse, 3 1st December 1880. By Mr E. Sang, . 18 
On the Preparation of Adamantine Carbon or Diamond. By B. 
Sydney Marsden, D.Sc., F.B.S.E., F. Inst. Chem., &c., 20 
Note on an Electric Sonometer. By Prof. James Blyth, . 28 
Theory to account for certain movements exhibited by low 
forms of Animal Life, and termed Amoeboid. By John 
B. Haycraft, Senior Demonstrator of Physiology in the 
University of Edinburgh, . . . .29 
Monday, 3d January 1880. 
On the Effect of Permanent Elongation on the Specific 
Besistance of Wires. By Mr T. Gray. Communicated 
by Sir William Thomson, . . . .31 
Meconic Acid. By Mr D. B. Dott. Communicated by 
Professor Crum Brown, . . . .31 
On the Crystallization of Silica from Fused Metals. By B. 
Sydney Marsden, D.Sc., F.B.S.E., F. Inst. Chem., &c., 34 
On Phosphorus Betaines. By Professor E. A. Letts, . 37 
On the Action of Haloid Compounds of Hydrocarbon Badi- 
cals on Phosphide of Sodium and on the Salts of Tetra- 
Benzyl-Phosphonium. By Professor Letts and FT. 
Collie, Esq., ...... 46 
Notice of an Easy Method for determining the Position of the 
Principal Focus of an Object-Glass. ByMrEDWARD Sang, 50 
Note on the Temperature Changes due to Compression. By 
Professor Tait, . . . . 51 
