dO 



Swan (Willinm) on the Red Promi- 

 nences seen during Total Eclipses of 

 the Sun, 135, 136. 



Account of a remarkable Me- 

 teor seen on 30th September 1853, 

 220. 



on Errors caused by imperfect 



inversion of the Magnet in obser- 

 vations of Magnetic Declinations, 

 318. 



on the Prismatic Spectra of 



the Flames of compounds of Carbon 

 and Hydrogen, 376. 



Talbot (II. Pox), F. U.S. On Fermafs 



Theorem, 371. 

 Teneriflfe, case of lateral refraction in, 



487. 

 Terrot (Bishop). On the summation 

 of a compound series, and its appli- 

 cation to a problem in Probabilities, 

 173. 

 on the Possibility of combin- 

 ing two or more independent Pro- 

 babilities of the same event, so as 

 to form one definite Probability, 

 366. 



Opening Address, 398. 



Tertiary Fosslliferous Deposit, under- 

 lying Basalt in Mull, 21. 

 Tertiary Deposit from Glen Shira, con- 

 taining Exuvia of Diatoms, 241. 

 Tertiary Plants in Greenland, 301. 

 Tethea, Structure and Economy of, 

 and description of a, new species, 

 181. 

 Therapeutic Agents, effects of, on the 



Blood, 282. 

 Thermic Phenomena of Currents of 



Elastic Fluids, 162. 

 Thermo-Electric Currents, on a me- 

 chanical theory of, 91, 255. 

 Thermotic Effect of the Compression 



of Air, 28. 

 Thomson (Murray). Analysis of Spe- 

 cimens of ancient British, of lied 

 Indian, and of Roman Pottery, 

 505. 

 Thomson (William) M.A. On the Dy- 

 namical Theory of Heat, with Nu- 

 merical Results deduced from Mr 

 Joule's Equivalent of a Thermal 

 Unit, and M. Regnault's Observa- 

 tions on Steam, 48. 



on a method of discovering 



experimentally the relation between 

 the Mochanicnl \Vorli spent, and the 

 heat produced by the Compression 

 of a Gaseous Fluid, 69. 

 on tlic Qunntities of Mechani- 



cal Energy contained in a fluid 

 mass, in different states, as to Tem- 

 perature and Density, 90. 



Thomson (William) on a mechanical 

 theory of Thermo-electric Currents, 

 91. 



on the mechanical action of 



Radiant Heat or Light; on theipower 

 of animated creatures over matter j 

 on the sources available to man for 

 the production of mechanical effect, 

 108. 



on a universal tendency in 



nature to the dissipation of me- 

 chanical energy, 131. 



— ■ on the mechanical energies 



of the solar system, 241. 



on the mechanical value of a 



cubic mile of sunlight, and on the 

 possible density of the Luminifer- 

 ous medium, 253. 



Account of Experimental in- 

 vestigations to answer questions 

 originating in the mechanical theory 

 of Thermo-electric Currents, 255. 



A mechanical theory of 



Thermo-electric Currents in Crys- 

 talline Solids, 255. 



Time-Ball Apparatus, 238. 

 Titanium in Amethyst, 159. 

 Titanium in Mica, 159. 

 Titanium in Topaz, 159. 

 Torbanehill Mineral, 199, 241. 

 Torbanehill Mineral, observations on 



the structure of, as compared with 



various kinds of coal, 217. 

 Tourmaline in Mica, 168. 

 Traill (Professor). Notice of some of 



the recent astronomical discoveries 



of Mr Lassell, 80. 

 Remarks on the Torbanehill 



Mineral, 199. 



on the supposed Sea Snake, 



cast on shore in the Orkneys in 

 1808, and the animal seen from 

 II.M.S. Da:dalus in 1848, 208. 



Traps, stratified, of the neighbour- 

 hood of Edinburgh, 268. 

 Turkish Weights and Pleasures, 3-i9. 

 Tyree, occurrence of Pumice in, 120. 



Urinary Secretion of Fishes, 452. 



Vibrations, theory of linear, 507. 



Vibrations, alligated, 507. 



Vision, on the extent to which the 

 theory of vision requires us to re- 

 gard the eye as a Camera Obscura, 

 303. 



Vision, recent discoveries in the ad- 



