Intelligence and Miscellaneous Articles. 



477 



mains from the chalk, and conglomerates from near King's Langley, 

 Herts. By H. Campbell White, Esq., F.G.S., &c, &c, &c— Quart- 

 zose slickenside and purple copper ore from Carn Brea mines, cry- 

 stals of the red oxide of copper, silicate of tin from Weald Coats, 

 copper pyrites and carbonate of iron from Wheal Tolgus, and a 

 new ore of copper from Great Saint George mine. By John Gar- 

 by, Esq., Associate of the Society. — Crystalline quartz from Knock- 

 mahon mine, county tff Waterford. By John Petherick, Esq. — ■ 

 Acicular oxide of copper from Knockmahon mine. By Captain 

 James Clemes. — Conglomerate from Slievnamann mountain, county 

 of Tipperary, and sandstone from Mohir, county of Clare. By Day 

 P. Le Grice, Esq., Member of the Society. — Specimens from vari- 

 ous localities. By the Rev. Henry Holden. — Organic remains from 

 Fowey and ' t Caerhayse. By C. W. Peach, Esq., Associate of the 

 Society. — Vitreous and purple copper ores, and copper pyrites from 

 Kenmare mine, county of Kerry. By Dillon Croker, Esq. — Recent 

 sandstone from Lelant. By the Rev. W. D. Longlands. — Wood 

 from the diluvium at St. Erth stream. By Mr. Samuel Peters. — 

 Hematite iron ore from Launceston, Van Diemen's Land. By 

 Richard Edmonds, Esq. — Specimens from the neighbourhood of 

 Killarney, county of Kerry, from Knockmahon mine, county of 

 Waterford, and from Cronebane, Tigrony, Connorree, Ballymur- 

 tagh, and Ballygahn, in the Vale of Ovoca, county of Wicklow. 

 By W. J.Henwood,C.E„ F.R.S., F.G.S., Secretary of the Society 

 and Curator of the Museum. 



Officers and Council for the present year : — 



President. — Sir Charles Lemon, Bart., M.P., F.R.S., &c. Vice- 

 Presidents.— Sir T. D. Acland, Bart., M.P., F.R.S. ; John Paynter; 

 John Taylor, F.R.S., &c. ; Stephen Davey. Treasurer. — Joseph 

 Carne, F.R.S. Joint Secretaries. — Samuel Pidwell, Jun.; W. J. 

 Henwood, F.R.S. Librarian. — Richard Hocking. Council. — John 

 Batten, John J. A. Boase, Thomas S. Bolitho, Samuel Borlase, 

 Charles Fox, Thomas Lean, J. N. R. Millett, Rev. M. N. Peters, 

 W. Petherick, N. Phillips, William Reynolds, W. M. Tweedy. 



LXXI. Intelligence and Miscellaneous Articles. 



ATOMIC WEIGHT OF CARBON. 



MM. DUMAS and Stas have, together, performed fourteen expe- 

 riments relative to the atomic weight of carbon ; the results all 

 agree, and were obtained either by the combustion of pure charcoal or 

 of highly carbonated and well-known substances. The combustion 

 was performed in oxygen, and care was taken to dry the gases obtained 

 either by sulphuric acid or chloride of calcium. Thus dried, they 

 were passed through two pieces of apparatus filled with solution of 

 potash, and a third filled with potash in powder. The increased 

 weight of the solutions and dry potash gave the weight of the car- 

 bonic acid obtained. Thus the weight of the carbon burnt, and of 

 the carbonic acid gas obtained, were known ; and from these, with- 



