401 



ample returns lo the enterprising companies, that have opened 

 them. 



There are several of the old gold mines in North Carolina, now 

 reopened for copper, and they give promise of proving more 

 valuable for that metal, than they ever were for gold. Amonf 

 those now about to send copper ores to market, is the McGinn 

 mine, near Charlotte, in Mecklinburg county. Some other simi- 

 lar mines are already in process of being opened, and promise 

 well. 



Dr. Jackson, lastly, exhibited two specimens of crystallized 

 tabular quartz, from Rutherford county. North Carolina, which 

 contained considerable quantities of water within them. He pro- 

 posed breaking open one of them for the purpose of anal) zing 

 the water, to ascertain if it contained any silex in solution. The 

 drusy, or crystalline nature, of the interior of specimens like 

 those which he had seen broken open in Dr. Andrews's cabinet, 

 in Charlotte, seemed to prove that they were once filled with a 

 solution of silica, which had crystallized upon the inside of the 

 cavities. 



Mr. Sprague called the attention of the Society to a re- 

 markable cluster of the cones of the common pitch pine, so 

 closely compacted as to conceal the branch, and also to a 

 stem showing the commencement of their growth, presented 

 to the Society by a lady. 



Dr. Jackson presented his " Report on the Copper Mine 

 of the North Carolina Copper Company." 



A " Memoire sur les Phenomenes Erratiques de laSuisse," 

 etc., by Mr. E. Desor, was received from him. 



BOOKS RECEIVED DURING THE QUARTER ENDING DECEMBER 31. 



Proceedings of the Academy of Natural Science of Philadel- 



PROCEEDINGS B. S. N. H. 26 APRIL, 1854. 



