Index. 
778 
on Instability of Vortex Motions, 
613. 
Thomson (Sir William), Mechanical 
Illustration of the Vibrations of a 
Triad of Columnar Vortices, 660. 
Application of Prof. Jas. Thom- 
son’s Integrator to Harmonic Analy- 
ses of Phenomena, and to the Integ- 
ration of Differential Equations, 138. 
His Address on Presenting 
the Makdougall- Brisbane Prize to 
Mr Alex. Buchan, M.A., 319. 
on Thermo-Dynamic Motivity, 
144. 
on Beats of Imperfect Har- 
monies, 602. 
Thunder (with Lightning), Lightning 
(only), Hail and Snow at Oxford, 
by Alex. Buchan, M.A., 135. 
Thunderstorms, On the Origin of, by 
Professor Tait, 136. 
Toothing of Unround Disks intended 
to roll upon each other, by E. Sang, 
393. 
Transformation of Infinite Series into 
Continued Fractions, by Thomas 
Muir, M.A., 117. 
Traquair (Dr It. H.) on New and 
Little-Known Fossil Fishes from 
the Edinburgh District, No. 1, 262; 
No. 2, 275 ; No. 3, 394, 427. 
on the Cranial Osteology of 
Rhizodopsis, and Structure of 
Rhizodus, 403, 444. 
on the genus Rhizodus, 657. 
Awarded the Neill Prize for 
the Triennial Period 1874-77, 549. 
Trimethyl-Sulphine, On the Action 
of Sulphuretted Hydrogen on the 
Hydrate and on the Carbonate of, 
by Professor Crum-Brown, 319. 
On the Action of Heat on 
some Salts of Trimethyl-Sulphine, 
by Professor Crum-Brown and J. 
Adrian Blaikie. B.Sc., 565, 712. 
Turpentine, Discharge of Electricity 
through, 579. 
Turner (Professor) on the Placenta- 
tion of the Cetacea ( Monodon Mo- 
noceros), 103. 
Tweeddale (George, Marquis of), 
Obituary Notice of, 225. 
Two-Dimensional Motion of mutually 
influencing Vortex Columns, and 
Two - Dimensional approximately 
Circular Motion of a Liquid, by Sir 
William Thomson, 98. 
Upsala, Report of the Deputation to, 
by Alex. Buchan, M.A., 521. 
Vector Conditions of Integrability, by 
Professor Tait, 527. 
Vignal (M.) on the Biliary Secretion 
and Cliolagogues, 334, 718. 
Volcanoes of the Hawaiian Islands, by 
J. W. Nicol, 113. 
Volcanic Debris, Distribution of, over 
the Floor of the Ocean, by John 
Murray, 247. 
Volcanic Eruptions of Iceland in 1874 
and 1875, by Captain Burton, 44. 
Volume-Integral. — Note on the Sur- 
face of a Body in terms of a Volume- 
Integral, by Professor Tait, 541. 
Vortex - Columns. — On Two - Dimen- 
sional Motion of mutually influ- 
encing Vortex-Columns, by SirWm. 
Thomson, 98. 
Vortex Core, by Sir Wm. Thomson, 69. 
Vortex Filament, by Sir William 
Thomson, 70. 
Vortex Motions, Instability of, by Sir 
William Thomson, 613. 
Vortex Statics, by SirWm. Thomson, 59. 
Vortex Theory of Gases, by Sir 
William Thomson, 144. 
Vortex Vibrations, by Sir William 
Thomson, 613. 
Vortices (Columnar), Illustration of 
the Vibrations of a Triad of, by 
Sir William Thomson, 660. 
Water, Compressibility of, by J. Y. 
Buchanan, 565. 
Watson (Rev. R. B.) on Dredging in 
Madeira, 153. 
Wave-Forms of Articulate Sounds, by 
Professor Fleeming Jenkin and Mr 
J. A. Ewing, 582, 714. 
W edgwood(Mr) on Origin of Language, 
100 . 
Wheatstone (Sir Charles) Obituary 
Notice of, 11. 
Whitney (Professor) on Origin of 
Language, 100. 
Wilson (Rev. John) on Parallel 
Motions, 161. 
Wires. See Electric Currents. 
Zodiacal Light, Observations on the, 
by C. Michie Smith, 110. 
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