Contents. 
v 
PAGE 
The Electro tonic Variation with Strong Polarising Currents. By 
George N. Stewart, D.Sc., Owens College, Manchester, . . 234 
Notice of Fundamental Tables in Trigonometry and Astronomy, 
arranged according to the Decimal Division of the Quadrant. By 
Edward Sang, LL.D., ...... 249 
On the Belation among the Line, Surface, and Volume Integrals. 
By Professor Tait, . . . . . . .257 
The Development of Diarthrodial Joints in .Birds and Mammals. 
By David Hepburn, M.B., M.B.C.S. (Eng.), Senior Demonstrator 
of Anatomy, University of Edinburgh. Communicated by Pro- 
fessor Sir W. Turner, ...... 258 
Electrification of Air by Flame. By Sir William Thomson, . 262 
On the Placentation of the Halicore Dugong. By Professor Sir 
William Turner, ....... 264 
On the Geographical Distribution of some Tropical Diseases, and 
their Relation to Physical Phenomena. By R. W. Felkin, M.D., 
F.R.G.S., Lecturer on Diseases of the Tropics and Climatology, 
Edinburgh Medical School. (With 16 Plates), . . . 266 
Quaternion Note on a Geometrical Problem. By Professor Tait, . 315 
The Solubility of Carbonate of Lime in Fresh and Sea Water. By 
W. S. Anderson, Esq., Chemist at Marine Station, Granton, . 319 
Secretion of Carbonate of Lime by Animals. Part II. By Robert 
Irvine, F.C.S., and G. Sims Woodhead, M.D., . . . 324 
Theoretical Description of a New “Azimuth Diagram.” By Captain 
Patrick Weir. Communicated by Sir William Thomson, , 354 
Note on Captain Weir’s Paper. By Professor Tait, . . . 359 
On the Coagulation of Egg and Serum Albumen, Vitellin, and 
Serum Globulin, by Heat. By John Berry Haycraft, M.D., D.Sc., 
and C. W. Duggan, M.B., . . . . . .361 
Some New Points in Connection with Muscle Contraction. By 
Alexander ’James, M.D., . . . . . 385 
The Theory of Determinants in the Historical Order of its Develop- 
ment. By Thomas Muir, M.A., LL.D., .... 389 
A Revision of the Genus Coscinodiscus and some Allied Genera. 
By John Rattray, M.A., B.Sc., F.R.S.E. (With Three Plates), . 449 
Molecular Constitution of Matter. By Sir William Thomson, . 693 
Continued Observations on the Progression and Rotation of Bivalve 
Molluscs, and of detached Ciliated Portions of them. By D. 
M ‘Alpine, Esq. Communicated by Dr Sims Woodhead. (With 
Two Plates), ....... 725 
