VI CONTENTS, 



On the Red Prominences seen during Total Eclipses of tlie Sun. 

 Part I. B7 WUliam Swan, F.R.S.E., . . .135 



On the Red Prominences seen during Total Eclipses of the Sun. 

 Part II. By William Swan, F.R.S.E., . . .136 



On a Universal Tendency in Nature to the Dissipation of Mechani- 

 cal Energy. By Professor William Thomson, . .139 



On Rifle Cannon. By Captain Davidson, Bombay Army. Com- 

 municated by Professor C. Piazzi Smyth, . . .142 



On two New Processes for the detection of Fluorine when accom- 

 panied by Silica, and on the presence of Fluorine in Granite, 

 Trap, and other Igneous Rocks, and in the Ashes of Recent and 

 Fossil Plants. By Dr George Wilson, . 143 



On a supposed Meteoric Stone, alleged to have fallen in Hamp- 

 shire in September 1852. By Dr George WUson, . . 147 



On the Glacial Phenomena of Scotland, and parts of England. By 

 Robert Chambers, Esq., ..... 148 



On the supposed occurrence of Works of Art in the Older Deposits. 

 By James Smith, Esq. of Jordanhill, . . . 158 



On the Optical Phenomena and Crystallization of Tourmaline, Ti- 

 tanium, and Quartz, within Mica, Amethyst, and Topaz, By 

 Sir David Brewster, K.H., D.C.L., F.R.S., V.P.R.S. Edin., 158 



On the Absolute Zero of the Perfect Gas Thermometer ; being a 

 Note to a Paper on the IMechanical Action of Heat. By W. J. 

 Macquorn Rankine, Esq., ..... 160 



On a Simplification of the Instruments employed in Geographical 

 Astronomy. By Professor C. Piazzi Smyth, . . . 161 



On a Mechanical Action of Heat, Section VI. : — A Review of the 

 Fundamental Principles of the Mechanical Theory of Heat ; 

 with remarks on the Thermic Phenomena of Currents of Elastic 

 Fluids, as illustrating those principles. By W. J. Macquorn 

 Rankine, Esq., ...... 162 



On the Structural Characters of Rocks. Parti. By Dr Fleming, 169 



Observations on the Speculations of the late Dr Brown, and of 

 other recent Metaphysicians, regarding the exercise of the Senses. 

 By Dr Alison, . . . . . .170 



On the Summation of a Compound Series, and its application to a 



Problem in Probabilities. By the Right Rev. Bishop Terrot, 173 

 On the Species of Fossil Diatomacea) found in the Infusorial Earth 

 of Mull. By Professor Gregory, .... 176 



On the Production of Crystalline Structure in Crystallized Powders 

 by Compression and Traction. By Sir David Brewster, K.H., 

 D.C.L., F.R.S., V.P.R.S.E., . . . .178 



On the Structure and Economy of Tethea, and on an undescribed 



species from the Spitzbergen Seas. By Professor Goodsir, . 181 

 On Circular Crystals. By Sir David Brewster, K.H., D.C.L., 



F.R.S., V.P.R.S.E., Associate of the Institute of France, . 183 

 On Nitric Acid as a source of the Nitrogen found in Plants. By 

 Dr George Wilson, ...... 189 



Observations on the Amount, Increase, and Distribution of Crime in 

 Scotland. By George ^lakgill, Esq. of Kemback, , . 190 



