U CONTENTS. 



Page 



On the Penetrativeness of Fluids. By J. K. Mitchell, M.D., 

 Lecturer on Medical Chemistry in the Philadelphia Medical 

 Institute . . . . . . .101 



Proceedings of the Royal Institution of Great Britain . ; .119 

 Proceedings of the Royal Academy of Sciences of Paris . 133 



Miscellaneous Scientific Proceedings on the Continent . .171 



FOREIGN AND MISCELLANEOUS INTELLIGENCE. 

 I. MECHANICAL SCIENCE. 



1. Parabolic Ridges formed on moving Water . . . 176 



2. New Theory of Capillary Action . . . . 177 



3. On the applicable Force exerted by a Horse . . . ibid. 



4. Bevan on the relative Hardness of Road Materials . . ibid. 



5. On the Bur of Perforations (R.W. Fox, Esq.) . . .179 



6. Condensation of Mercury by Pressure . . ibid. 



7. Instrument for the Condensation of Water by the Pressure exerted 



by Water at great depths of the Ocean (Invented by Professor Par- 

 rot of Dorpat) . . . . . .180 



8. Comparison of the Prussian Weights and Measures with the new 



English Weights and Measures (Professor Eytelwein) . ibid. 



$ II. CHEMICAL SCIENCE. 



1. On the Electro-Magnetic Effects of Metallic Plates having various Posi- 



tions, Intervals, &c. &c. (M. Bigiou) ... 181 



2. Hare's Delicate Galvanometer ..... ibid. 



3. Powerful Electro-Magnet (Professor Henry and Dr. Ten Eyck) 182 



4. On Electricity induced by the Red and Violet Rays of the Solar 



Spectrum ...... ibid. 



5. On the Identity of the Nervous and Electric Fluids . .183 



6. Singular Electrical Effect . . . . 184 



7. Explosion of Phosphorus and Nitric Acid . . . ibid. 



8. On the Phosphorescence of certain Substances . . 18& 



