Vi CONTENTS. 



Page 

 Prof. Forbes on the Muscular Effort required to ascend Planes 



of different Inclinations 261 



Mr. Heineken on the Aurora Borealis of February 18th, 1837, 



as observed at Sidmouth, in Devonshire 265 



Dr. Schcenbein's Experimental Researches on a peculiar Action 



of Iron upon Solutions of some Metallic Salts 267 



Mr. H. M. Noad on the peculiar Voltaic Condition of Iron . . 276 

 Mr. Brooke on the Intersection of Crystals belonging to dif- 

 ferent Minerals in a regular and constant manner 278 



Mr. J. Taylor on Peroxide of Manganese containing Silver, 



from Mexico 279 



The Rev. W. Ritchie, LL.D. on the electric Spark and Shock 



from a permanent Magnet 280 



Mr. F. W. Mullins on the Development and Action of Elec- 

 tricity in Voltaic Combinations 281 



New Books : — Solly on the Human Brain 286 



Proceedings of the Zoological Society 287 



., Geological Society 306 



. Cambridge Philosophical Society 316 



at the Meetings of the Royal Institution 317 



Fossil Infusoria used for Food 318 



Palaeontology: — Organic Forms of certain Minerals 318 



Pyrophori of easy preparation 319 



Notice of M. Mossotti's Mathematical Researches relative to 



the Laws of Molecular Action 320 



lodal 321 



On the Oxibromides and some other Compounds of Tungsten 322 



On Chloroform and Cyanoform 322 



Analysis of Silk 323 



Fossil Maize 323 



Vegetation in a Solution of Arsenic 324? 



Indigo 324 



On some of the Properties of Per-iodic Acid 325 



Mr. J. Watson's Experiment in Electricity 326 



Voluntary Sounds of Insects 327 



Meteorological Observations 327 



NUMBER LXII.— MAY. 



Dr. T. Clark on Cyanide of Potassium, an incidental Product 

 of the Process for making Cast Iron in Blast Furnaces .... 329 



Mr. R. H. Brett's Further Experiments on the Solubility of 

 certain Metallic Oxides and Salts in Muriate and Nitrate of 

 Ammonia 333 



Mr. Kelland on the Laws of Transmission of Light and Heat 

 in Uncrystallized Media 336 



Mr. J. Barton on the Physical Causes of the principal Phaeno- 

 mena of Heat 342 



