the Ores of Manganese. 



though I am aware that to give names of this kind to old spe- 

 cies is arrogating ta one's self a great portion of authority, yet 

 I believe this to be the only consistent plan, the advantages of 

 which will no doubt overbalance every consideration of difficul- 

 ty. Their explanation will be given with the description of 

 each of the species. 



When I began to collect the information contained in works 

 on mineralogy relative to the localities of the different species, 

 the result was scanty, and on account of the erroneous determi- 

 nation, generally uncertain. I resolved therefore, in enumerating 

 the localities, to mention those only which I knew to be correct 

 either from personal knowledge, or by comparing the localities, 

 attached to specimens in the various collections, with the verbal 

 information of several of my mineralogical friends. With this 

 view, I have examined the mineralogical cabinets of Mr ALLAN 

 and Mr W. G. THOMSON in Edinburgh, of Mr VON STRUVE and 

 Mr HERTZ in Hamburgh, of the Royal Museum and of MrTAM- 

 NAU in Berlin, of the National Museum in Prague, and of Mr 

 VON PITTONI in Vienna, and of the public museums in that city, 

 the Imperial Cabinet, the Brazilian collection, and that of the 

 Polytechnic Institution. I have been indebted to the proprie- 

 tors of the private collections, and the gentlemen attached to 

 the public ones, for much kindness and many interesting notices 

 of such localities as they had visited themselves, or were other- 

 wise acquainted with ; especially to Professor GUSTAVUS ROSE, 

 Professor ZIPPE, Professor MOHS, Mr PARTSCH, Dr POHL, and 

 Professor RIEPL. From Mr VON LEONHARD, Professor BER- 

 THIER, and Mr LEMAN, I also obtained some interesting speci- 

 mens, and much valuable information. 



VOL. XI. PART I. Q, 



