CONTENTS. ▼ 



0U8 Temperatures, from the experiments of M. Regnault. By 

 W. J. Macquom Rankine, . . • t.", -jat ' 



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

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

 sor William Thomson, . • • ' d r> * 

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

 fessor William Thomson, . • • ' t> r ' 

 On the Absolute Intensity of Interfering Light. By Professor 



Stokes. Communicated by Professor Kelland, • * ^° 



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



How. Communicated by Dr T. Anderson, . . ' 



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



Piazzi Smyth, . • • • ' , . . * 



Defence of the Doctrine of Vital Affinity, against the Objections 



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



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



Crowder. Communicated by Dr Anderson, . • .10/ 



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

 originators of the Corpuscular Constituents of the Blood. By 

 Dr Bennett, . • • • ' r^ i ^^' 



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, . . • • 1"° 



On some Improvements in the Instruments of Nautical Astronomy. 



By Professor C. Piazzi Smyth, . . • • 11* 



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

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

 Stewart, Esq., . • • • ' • * -j 



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 ArgyU, . • • ^ , 'o 



Recent Observations on the direction of the Strise on Rocks and 



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

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



HEICS . ' • • ' 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 (Salvia umbla), 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, 126 

 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, . • • " -d 



Researches on some of the Crystalline Constituents of Opium. By 

 Dr Thomas Anderson, . • • • .132 



