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CONTEXTS. Vll 



Page 



Mr. James Hargheates on the Separation from L-on-Furnace Cinder of 



Phosphoric Acid for Manurial Purposes GO 



The Rev. H. Highton on Artificial Stone and various kinds of Silica CO 



Dr. HuBTER on the Time needed for the completion of Chemical Changes . . GO 



Mr. A. GoRDOX on the Prevention of Lead-poisoning in Water CO 



Mr. W. Marriott on the Estimation of Sulphur in Coal-gas GO 



Dr. Mac Vicar on the Typical Hj-drocarbous, from Marsh-gas to Anthracene, 

 ■with the Oxidation of the latter into Anthroquinone and Alizarine Gl 



Mr. T. Moffatt on Atmospheric Ozone CI 



on the Quantity of Phosphoric Acid excreted from the 



System in connexion with Atmospheric Conditions Gl 



Mr. J. BiRKBECK Neyins on a New Theory respecting the Heating of 



Liquids Gl 



Mr. W. H. Perkins on Artificial Alizarine 01 



Mr. J. Arthur Phillips's Note on Claudet's Process for the Extraction of 



Silver Gl 



]\Ir. W. Chandler Roberts on the Absorption of Hydrogen by Electro- 

 deposited Iron G.w 



Professor H. E. Roscoe on Vanadium, illustrated by Preparations of its Com- 

 pounds Go 



Mr. E. ScHUNCK on the Chemical Composition of Cotton 63 



Mr. J. Bergeb Spence on the Phenomena of the Crystallization of a Double 



Salt G3 



Mr. Peter Spence on an Attempt to determine the Boiling-point of the 



Saturated Solutions of various Salts by boiling with Steam of 100° CI 



Mr. J. Spiller on the Discrimination of Fibres in Mixed Fabrics 64 



Mr. Edward C. C. St^vnford on Marbles from the Island of Tyree 64 



on the Retention of Organic Nitrogen by Char- 

 coal Go 



Mr. Charles R. C. Tichborne on Dust as a Ferment G5 



Mr. C. ToMLiNSON on the Action of Low Temperatures on Supersaturated 



Saline Solutions G7 



on a Salt invisible in its Mother Liquor 67 



Mr. W. H. Walenn on the Electro-deposition of Copper and Brass 67 



Mr. Walter Weldon on the Weldon Process for the Manufacture of 



Chlorine G8 



Professor A. W. Williamson's Communication respecting a Resolution of 

 the Committee of Section B on the proposed establishment of a New School 

 of Applied Science by Government G8 



GEOLOGY. 



Dr. Leith Adams on Newly discovered Species of Elephants 69 



Mr. D. T. Ansted's Notes of a recent Visit to the Great Tunnel through the 

 Alps, and of several points of Geological interest suggested by the condi- 

 tion of the Works in their present nearly complete state GO 



Mr. James Bryce on the Matrix of the Gold in the Scottish Gold-fields 70 



Mr. William Carkuthehs on the History and Affinities of the British 

 Coniferse > 71 



