Vlii CONTENTS. 



l*yromeconic Aoid. By Mr James Brown, Assistant to Dr Thomas 

 Anderson, ....... 235 



On the Products of Destructive Distillation of Animal Substances. 

 Part III. By Dr Thomas Anderson, . . . 238 



Notice of the Completion of the Time-Ball Apparatus. By Pro- 

 fessor C. Piazzi Smyth, ..... 238 



On a Black Tertiary Deposit, containing the Exuviae of Diatoms, 

 from Glen Shira. By Dr Gregory, . . . 241 



Additional Note to a Paper on the Structure of Coal, and the Tor- 

 banehill Mineral, By Dr Bennett, . . . 241 



On the Mechanical Energies of the Solar System. By Professor 

 William Thomson, . . . . .241 



Further Researches on the Crystalline Constituents of Opium. By 

 Dr Thomas Anderson, . . . . .244 



On the Action of the Halogen Compounds of Ethyl and Amyl on 

 some Vegetable Alkaloids. By Mr Henry How, Assistant to Pro- 

 fessor Anderson of Glasgow, .... 244 



On the Mechanical Value of a Cubic Mile of Sunlight, and on the 

 possible density of the Luminiferous Medium. By Professor W. 

 Thomson, . . . . . . . 253 



Account of Experimental Investigations to answer questions origi- 

 nating in the Mechanical Theory of Thermo-Electric Currents. 

 By Professor W. Thomson, .... 255 



Dynamical Theory of Heat, Part VI. continued. A Mechanical 

 Theory of Thermo-electric Currents in Crystalline Solids. By 

 Professor W. Thomson, ..... 255 



On the Structure of Diatomaceae. By E. W. Dallas, Esq., . 256 



Farther Experiments and Remarks on the Measurement of Heights 

 by the Boiling Point of Water. By Professor J. D. Forbes, 261 



On the Chemical Equivalents of Certain Bodies, and the Relations 

 between Oxygen and Azote. By Professor Low, . . 263 



Some Observations on the Salmonidss. By John Davy, M.D., 

 F.R.SS., Lend, and Edin., Inspector- General of Army Hos- 

 pitals, ....... 267 



On the Structural Character of Rocks. Part 111., embracing re- 

 marks on the Stratified Traps of the neighbourhood of Edinburgh. 

 By Dr Fleming, . . . . . .268 



Notes on some of the Buddhist Opinions and Monuments of Asia, 

 compared with the Symbols on the Ancient Sculptured " Stand- 

 ing Stones" of Scotland. By Thomas A. Wise, M.D., . 272 



Note on the extent of our knowledge respecting the Moon's Sur- 

 face. By Professor C. Piazzi Smyth, . . .274 



On the Interest strictly Chargeable for Short Periods of Time. By 

 the Rev. Professor Kelland, . . . .274 



Some additional Experiments on the Ethers and Amides of Me- 

 conic and Comenic Acids. By Henry How, Esq. Communicated 

 by Dr Anderson, ...... 277 



On a Revision of the Catalogue of Stars of the British Association. 

 By Captain W. S. Jacob, H.E.I.C, Astronomer at Madras. Com- 

 municated by Professor C. Piazzi Smyth, . . . 279 



