IV CONTENTS. 



Biographical Notice of the late Robert Stevenson, Esq., Civil Engi- 

 neer. By his Son, Alan Stevenson, LL.B. Communicated by 

 Dr T. S. Traill, ...... 30 



Historical Notice of the Progress of the Ordnance Survey in Scot- 

 land. By Alexander Keith Johnston, Esq., . . .31 



On Iron and its Alloys. Part I. By J. D. Morries Stirling, Esq., 43 



On the Weight of Aqueous Vapour, condensed on a Cold Surface, 

 under given conditions. By James Dalmahoy, Esq., . . 43 



On the Poison of the Cobra da Capello. By Dr J. Rutherford Rus- 

 sell. Communicated by Dr Gregory, . . .44 



On a New Source of Capric Acid, with Remarks on some of its 

 Salts. By Mr T. H. Rowney. Communicated by Dr Anderson, 45 



On Iron and its Alloys. Part II. By J. D. Morries Stirling, Esq., 46 



On the Dynamical Theory of Heat, with Numerical Results deduced 

 from Mr Joule's Equivalent of a Thermal Unit, and M. Reg- 

 nault's Observations on Steam, By William Thomson, M.A., 

 Fellow of St Peter's College, Cambridge, and Professor of Na- 

 tural Philosophy in the University of Glasgow, . . 48 



On the Geology of the Eildon Hills. By Professor J. D. Forbes, 53 



On certain Salts of Comenic Acid. By Mr Henry How. Com- 

 municated by Dr Anderson, . . . . .54 



On the Crystallization of Bicarbonate of Ammonia in Spherical 

 Masses. By Dr G. Wilson, . . . . .57 



On the Compressibility of Water. By W. J. Macquorn Rankine, 

 Esq., C.E., ....... 58 



On the Economy of Single-Acting Expansive Steam-Engines, and 

 Expansive Machines generally ; being Supplements to a Paper 

 on the Mechanical Action of Heat. By W. J. M. Rankine, Esq., 

 C.E., ....... 60 



On the Products of the Destructive Distillation of Animal Sub- 

 stances. Part 11. By Dr Anderson, . . .64 



On CarmufeUic Acid. By Dr Sheridan Muspratt and Mr Danson, 65 



Farther Remarks on the Intermitting Brine Springs of Kissingen. 

 By Professor Forbes, . . . , .66 



On a Method of Discovering Experimentally the Relation between 

 the Mechanical Work spent and the Heat produced by the Com- 

 pression of a Gaseous Fluid. By Professor William Thomson, 69 



On the Total Eclipse of the Sun on July 28, 1851, observed at Gote- 

 borg; with a description of a new Position Micrometer. By 

 William Swan, Esq., . . . , .73 



On the Total Solar Eclipse of July 28, 1851, as seen on the west 

 coast of Norway. By Professor C. Piazzi Smyth, . . 78 



On the Nature of the Red Prominences observed during a Total 

 Solar Eclipse. By Professor C. Piazzi Smyth, . . 79 



Notice of some of the recent Astronomical Discoveries of Mr Las- 

 sell. By Dr Traill, . . . . . .80 



On the Centrifugal Theory of Elasticity and its connection with 

 the Theory of Heat. By W. J. Macquorn Rankine, Esq., C.E., 86 



On the Computation of the Specific Heat of Liquid Water, at vari- 



