iv CONTENTS OF VOL. IV. FOURTH SERIES. 



Page 

 Mr. J. D. Perrins on the Occurrence of Berberine in the Co- 

 lumba Wood of Ceylon, the Menispermum fenestratum of 



Botanists 99 



Prof. Chajiman on Artesian Wells near Silsoe in Bedfordshire. 102 

 Prof. Thomson on the Dj'namical Theory of Heat, with nume- 

 rical results deduced from Mr. Joule's equivalent of a Thermal 

 Unit, and M. Regnault's Observations on Steam {continued). 105 

 Prof. Rammelsbers^ on the Chemical Constitution of Childrenite. 118 

 The llev. J. Bashforth's Remarks on Mr. Dresser's Exprriments 

 on the Conducting Powers of Wires for Voltaic Electricity, 

 and on Mr. Joule's Experiments with a powerful Electro- 

 magnet 120 



Mr. II. Phillips on the Electrical Condition of the Atmosphere, 



and on the Colours of a Jet of Steam 126 



Mr. M. Donovan on the supposed Identity of the Agent con- 

 cerned in the Pheenoraena of ordinary Electricity, Voltaic 

 Electricitj^, Electro- Magnetism, Magneto -electricity, and 



Thermo-electricity {continued) 130 



Mr. J. J. Sylvester on a Demonstration of the Theorem that 

 every Homogeneous Quadratic Polynomial is reducible by 

 real orthogonal substitutions to the form of a sum of Positive 



and Negative Squares 138 



Mr. J. D. Smith on Early Egyptian Chemistry 142 



Dr. Lamont's Addenda to the Investigation on the Decennial 

 Peiiod in tlie Magnitude of the Daily Motion of the Magnetic 



Needle 145 



Proceedings of tlie Roj'al Society 147 



Researches on the Sulphurets which are decomposable by Water, 



by E. Fremy 153 



On the Existence of Organic Matter in Stalactites and Stalag- 

 mites, forming Crystallized and Amorphous Crenateof Lime, 



by David A. Wells 155 



On the new Metal Donarium 156 



On a new mode of Measuring High Temperatures, by Mr. John 



Wilson 157 



Meteorological Observations for June 1852 159 



Table 160 



NUMBER XXIV.— SEPTEMBER. 



Mr. J. F. Brown on some Salts and Products of Decomposition 

 of Pyromeconic Acid 161 



Prof. Thomson on the Dynamical Theory of Heat, with nume- 

 rical results deduced from Mr. Joule's equivalent of a Thermal 

 Unit, and M. Regnault's Observations on Steam {continued). 168 



Dr. Barry's Renewed Inquiries concerning the Spiral Structure 

 of Muscle, with Observations on the Muscularity of Cilia 

 (concluded) 177 



