392 Intelligence and Miscellaneous Articles. 



of Tin in the Duchy of Cornwall, Secretary to the Society, and Cu- 

 rator of the Museum. On the assaying of copper ores by means 

 of Galvanism. By Martyn J. Roberts, Esq., Corresponding Member 

 of the Society. On the expansive action of steam in the cylinders 

 of the Cornish Pumping Engines. By W. J. Henwood, F.G.S., 

 Hon. M.Y.P.S., &c. On the rocks associated with the metalliferous 

 formations of the Wherry Mine. By Richard Pearce, Esq., Member 

 of the Society. On the organic remains in the slates of Paraver, 

 Parr, Polkerris, Fowey, and Polruan. By C. W. Peach, Esq., As- 

 sociate of the Society. On the raised Beaches of Portscathoe. By 

 John S. Enys, Esq., Member of the Society. On a section of the 

 cliffs on the north coast of Cornwall, from Cligga Point to Lower 

 Saint Columb Porth. By W. J. Henwood, F.G.S., Corresponding 

 Member of the Plymouth Institution. On some improved methods 

 of blasting rocks. By Martyn J. Roberts, Esq. An account of the 

 Quantity of Tin produced in Cornwall and Devon, in the year ending 

 with the Midsummer Quarter, 1838. By Joseph Carne, Esq., F.R. 

 & G.S., M.R.I. A., &c. An account of the Quantity of Copper pro- 

 duced in Great Britain and Ireland, in the year ending 30th June, 

 1838. By Alfred Jenkyn, Esq. 



The following Gentlemen have been elected since the last Report. 

 Corresponding Members. — John Edward Lee, Esq. , of Hull. Martyn 

 J. Roberts, Esq. Ordinary Members. — Vincent Pryce, Esq., of 

 Redruth. Frederick Rogers, Esq. The Rev. George Boraston, of 

 Kenegie. The Rev. H. Comyn, of Sancreed. Edwin Ley, Esq. 

 John Vigurs, Esq. Associates. — Captain John Lyle, of Camborne. 

 Captain James Evans, of St. Agnes. John Garby, Esq., of Redruth. 



Officers and Council for the present Year. President. — Davies 

 Gilbert, Esq., D.C.L., V.P.R.S., &c., &c. Vice-Presidents.— 5 oha 

 Basset, Esq. Day P. Le Grice, Esq. E. W. W. Pendarves, Esq., 

 M.P., F.R.S., &c. Henry Woollcombe, Esq., F.A.S., &c. Secre- 

 tary and Curator. — W. J. Henwood, F.G.S., London and Paris. 

 Treasurer. — Joseph Carne, F.R.S., F.G.S., &c. Librarian. — Richard 

 Hocking, Esq. Council. — Capt. Davies, R.N. Mr. James Flamank, 

 Charles Fox, Esq. William Gibbins, Esq. Rev. H. E. Graham. 

 Edwin Ley, Esq. Richard Pearce, Esq. Major Robyns. W. 

 Mansel Tweedy, Esq., F.H.S., &c. John Vigurs, Esq. L. R. Wil- 

 lan, M.D. Wm. Williams, Esq. 



LII. Intelligence and Miscellaneous Articles. 



REAGENT FOR THE DETECTION OF SULPHUROUS ACID IN THE 

 HYDROCHLORIC ACID OF COMMERCE. BY GIRAKDIN. 



THE hydrochloric acid of commerce often contains sulphurous acid, 

 especially when prepared on the large scale in the alkali manu- 

 factories : this contamination cannot be detected by the odour, but in 

 the protochloride of tin we have an excellent test for its presence. 

 For this purpose, crystals of the chloride should be dissolved in the 

 suspected acid, which if free from sulj)hurous acid will dissolve the 

 chloride, with the production of a very insignificant troubling. If 



