VI CONTENTS. 



Dr. Golding Bird's Observations on some peculiar Properties 

 acquired by Plates of Platina, which have been used as the 



Electrodes of a Voltaic Battery 379 



Proceedings of the Geological Society, and Royal Geological 



Society of Cornvi^all 386 



Reagent for the Detection of Sulphurous Acid in the Hydro- 

 chloric Acid of Commerce, by Girardin 392 



Processes for preparing Lithia, by Fuchs , 393 



New Double Salt of Zinc and Potassium, by Anthon 393 



Reagent for Nitric Acid and Nitrogen, by Desbassayns de 



Richemont '. 393 



Formate of Soda, as a reducing Substance for metallic Poisons 



(Arsenic) 394 



On the Transparency of Carbon, by Degen 394 



Preparation of arseniuretted Hydrogen, by Vogel 395 



Tungstate of Tungsten and Potash 395 



Analysis of Serum of Blood drawn from a diabetic Patient, by 



Dr. G. O. Rees 395 



Analysis of the Liquor Amnii 395 



Stearopten of Turpentine 396 



Metallic Pectates 397 



Portrait of Prof. Faraday 399 



Portrait of Robert Brown, F.R.S., &c 399 



Meteorological Observations 399 



NUMBER LXXXIV.— DECEMBER. 



Prof. Dr. Jacobi on the Galvanic Spark 401 



Prof. J. F. W. Johnston on some apparent Exceptions to the 

 Law, that like CrystalUne Forms indicate like Chemical 

 Formulae 405 



Mr. Faraday's Experimental Researches in Electricity. — 

 Eleventh Series 412 



Mr. W. R. Grove on a new Voltaic Combination 430 



Mr. J. B. Nevins on the Reduction of the Chlorides of Mercury 

 when mixed with Organic Substances 431 



Rev. E. Craig on the Process for obtaining the Bichromate of 

 the Perchloride of Chrome, as viewed under the Microscope 433 



Mr. D. F. Gregory on the Experiments detailed in Mr.Waldie's 

 Paper on Combustion and Flame, inserted in the Lond. and 

 Edinb. Phil. Mag. for August 1838 434 



On a certain Difficulty connected with the Demonstration of 

 Euclid, Book L Prop. 29 434 



Mr. J. P. Gassiot on a remarkable Difference in the Heat at- 

 tained by the Electrodes of a powerful Constant Battery : in 

 a Letter to Mr. Brayley 436 



Dr. R. Kane on the Composition of Essential Oils 437 



Prof. J. J. Sylvester on the Motion and Rest of Fluids 449 



