CONTENTS. V 



ous Temperatures, from the experiments of M. Regnault. By 

 W. J. Macquorn Rankine, . . . . . 90 



On the Quantities of Mechanical Energy contained in a Fluid Mass, 

 in different states, as to Temperature and Density. By Profes- 

 sor William Thomson, . . . . .90 



On a Mechanical Theory of Thermo-Electric Currents. By Pro- 

 fessor William Thomson," . . . . .91 



On the Absolute Intensity of Interfering Light. By Professor 

 Stokes. Communicated by Professor Kelland, . . 98 



On Meconic Acid, and some of its Derivatives. By Mr Henry 

 How. Communicated by Dr T. Anderson, . . .99 



On the Place of the Poles of the Atmosphere. By Professor C. 

 Piazzi Smyth, . . . . . .101 



Defence of the Doctrine of Vital Affinity, against the Objections 

 stated to it by Humboldt and Dr Daubeny. By Dr Alison, 105 



On the Fatty Acid of the Cocculus indicus. By Mr William 

 Crowder. Communicated by Dr Anderson, . . . 107 



On the Function of the Spleen and other Lymphatic Glands, as 

 originators of the Corpuscular Constituents of the Blood. By 

 Dr Bennett, . . . . . .107 



On the Mechanical action of Radiant Heat or Light : On the 

 Power of Animated Creatures over Matter: On the Sources 

 available to Man for the production of Mechanical Effect. By 

 Professor William Thomson, . . . .108 



On some Improvements in the Instruments of Nautical Astronomy. 

 By Professor C. Piazzi Smyth, . . . .114 



Notice of an Antique Marble Bust. By Andrew Coventry, Esq., 115 



Note on a Method of procuring very rapid Photographs. By John 

 Stewart, Esq., . . . . . .116 



On some Salts and Products of Decomposition of Pyromeconic Acid. 

 By Mr James F. Brown. Communicated by Dr Anderson, 117 



On the Organs in which Lead accumulates in the Horse, in cases 

 of slow poisoning by that Metal. By Dr George Wilson, . 119 



Notice regarding the occurrence of Pumice in the Island of Tyree. 

 By the Duke of Argyll, . . . . .120 



Recent Observations on the direction of the Striae on Rocks and 

 Boulders. By James Smith, Esq., .... 121 



On the Analysis of some Scottish Minerals. By Dr A. J. Scott, 

 H.E.LC.S., . • . . . .122 



On a Necessary Correction in the Height of the Barometer depend- 

 ing on the Force of the Wind. By Captain Henry James, R.E. 

 Communicated by Professor Piazzi Smyth, . . . 124 



Some Observations on the Charr (Salmo umhla), relating chiefly to - 

 its Generation and Early Stage of Life. By John Davy, M.D., 

 F.R.SS. Lond, & Edinb., Inspector-General of Army Hospitals, 125 



On a Modification of the Process for the determination of Nitrogen 

 in Organic Compounds. By Alexander Kemp, Esq., . 126 



An Account of some Experiments on the Diet of Prisoners. By 

 Professor Christison, . . . . .130 



Researches on some of the Crystalline Constituents of Opium, By 

 Dr Thomas Anderson, . . . . .132 



