CONTENTS. 



CHEMISTRY. 



Page 

 Extracts from a Letter addressed by Dr. Hare to the Chemical Section 



of the British Association for the Advancement of Science 39 



Dr. Thomas Thomson's Observations on the Foreign Substances in Iron. . 41 



Dr. Thomas Thomson on the Sugar in Urine of Diabetes 43 . 



Dr. Thomas Thomson on Galaetin 46 



Dr. Thomas Thomson's Notice respecting the native Diarseniate of Lead... 46 



Dr. T.Thomson and Mr. T. Richardson on Emulsin 48 



Mr. Thomas Richardson's Examination of Sphene 49 



Mr. H. L.Pattinson on a New Process for the Extraction of Silver from 



Lead 50 



Dr. GoLDiNG Bird's Observations on some of the Products obtained by the 



Action of Nitric Acid on Alcohol 55 



Dr. GoLDiNG Bird's Notice respecting the Artificial Formation of a Basic 



Chloride of Copper by Voltaic Influence 56 



Dr. GoLDiNG Bird's Notice respecting the Deposition of Metallic Copper 

 from its Solutions by slow Voltaic Action at a point equidistant from 



the Metallic Surfaces 57 



Professor Johnston on a new Compound of Sulphate of Lime with Water 59 

 Professor Johnston on a new Compound of Bicyanide with Binoxide of 



Mercury ••■• 59 



Prof. Johnston on some supposed Exceptions to the Law of Isomorphism 59 

 Professor Johnston on the Origin of Petroleum, and on the Nature of 



the Petroleum from Whitehaven 60 



Professor Johnston on Middletonite and some other Mineral Substances 



of Organic Origin 60 



Professor Johnston on the Resin of Gamboge (Gambodic Acid) and its 



Compounds 60 



Mr. R. Phillips on a Blue Pigment 60 



Mr. C. T. Coathupe on the Blue Pigment of Dr. Traill 61 



Mr. R. Mallet on a new case of the Chemical Action of Light in the Deco- 

 loration of Recent Solutions of Caustic Potass of Commerce 61 



Mr. Scanlan's Observations on the Constitution of the Commercial Carbo- 

 nate of Ammonia 63 



Mr. Scanlan on the Blackening of Nitrate of Silver by Light 63 



Rev. T. ExLEY on the Specific Gravities of Nitrogen, Oxygen, Hydrogen, 

 and Chlorine ; and also of the Vapours of Carbon, Sulphur, Arsenic, 



and Phosphorus 64 



Rev. T. ExLEY on Chemical Combinations produced in virtue of the pre- 

 sence of other bodies which still remain 68 



Mr. John Samuel Dawes on an Improvement in the Manufacture of Iron, 



by the Application of Gas obtained from the decomposition of Water... 68 

 Dr. Andrews on the Influence of Voltaic Combination on Chemical Action 69 

 Mr. Robert Addams on the Construction of Apparatus for solidifying Car- 

 bonic Acid, and on the elastic Force of Carbonic Acid Gas in contact 



with the liquid form of the Acid, at different Temperatures 70 



Mr. William Herapath on a New Process for Tanning 71 



Mr. William West on some New Salts of Mercury 72 



Mr. William Maugham on a New Compound of Carbon and Hydrogen. . 72 

 Mr. William Maugham on a Mode of obtaining an Increase of Atmo- 

 spheric Pressure, and on an Attempt to liquefy Hydrogen and Oxygen 



Gases, with accompanying Apparatus 73 



Mr. John Murray on the Water of the Dead Sea ' 73 



