observed by Idm in 1835. 407 



again seeing the new star. Cacciatore has addressed these 

 observations to the Bibliotheque Universelle, for the purpose 

 of attracting the attention of astronomers ; and we have 

 inserted them here, in order that the scientific men of this 

 country may be aware of the facts. 



Article III. 



On the Minerals containing Columbium. By Thomas 

 Thomson, M. D., F. R. S., L.&E., Regius Professor of 

 Chemistry in the University of Glasgow. 



The minerals containing columbium are so scarce, that I 

 am not aware of any attempt hitherto made to draw up a 

 mineralogical description of them ; far less to subject them 

 to a chemical analysis. Dr. Torrey of New York, was 

 kind enough during the course of the present summer to 

 send me several specimens of columbite, from a new 

 American locality, together with a request to subject the 

 mineral to a chemical analysis. It turned out on exami- 

 nation to be a new species, not hitherto mentioned by 

 mineralogists. This led me to examine the Bohemian 

 columbite, a specimen of which, liberally presented to me 

 more than 20 years ago, by Mr. Heuland, I have in my 

 cabinet. This last is the variety to be found in mineral 

 collections, and seems to be the same with the specimen of 

 columbite in the British Museum, originally examined by 

 Mr. Hatchett. From a statement in Haidinger's edition of 

 Mohs's Mineralogy,* it appears that this mineral has been 

 analyzed by Vogel and Count Borkowski, the results of 

 whose analyses are given ; though I do not know where 

 they were published.f 



The tantalite from Kimito in Finland, originally exa- 

 mined by Ekerberg, and afterwards analyzed by Berzelius, 

 constitutes a third species.:}: While another specimen from 



* Vol. ii. p. 392. 



t These results are as follows : — 



Columbic acid, 75 74 



Oxide of tin 1 0-4 



Oxide of iron 17 20 



Oxide of manganese . ... 5 4*6 



98 99 

 X Afliandlingar, iv. 262. 



