Intelligence and Miscellaneous Articles. 



475 



16. Observations of Distance of the Comet from known stars, 

 made at Demerara by Captain Geale of the ship Isabella, Lieutenant 

 A. S. Glascott, R.N., and James Donald, Esq. Communicated by- 

 Sir John Herschel. 



March 11 at7 h 20 ra M.T. 



March 12 at 7 22 



March 13 at 7 5 



March 19 at 7 15 



March 26 at 7 10 



March 27 at 7 12 



March 31 at 7 35 



> rRigel = 50 23 



Distance of comet from J g^Su^" = 77 30 



LCanopus = 68 23 

 Length of tail 46°. 



rRigel = 47 24 



Sirius = 69 



Distance from < Aldebaran =46 40 



Canopus = 67 H 



l Capella ... = 71 55 



r Canopus... = 65 1 



«*— ■•- ISfcrSS 



[ Aldebaran = 43 30 

 r Capella ... = 62 24 



J Sirius = 54 14 



1 Canopus.. = 59 17 

 LRigel = 32 6 



Distance from. 



Length of tail 42°. 



r Sirius = 44 10 



Distance from J £ a P ella '" = f_ f R 



j Canopus... = 55 46 



Length of tail 32° 



Distance from 



Length of tail 30° 



iRigel = 21 35 



{Sirius = 43 8 

 Rigel =20 30 

 Canopus... = 55 37 

 Capella ... = 56 28 



f Canopus... = 53 28 



J Sirius = 58 31 



• I Capella ... = 54 41 

 L Aldebaran = 23 30 

 Length of tail 24°. 



17 . Some Account of the Comet, in a Letter from J. Gimblett, Esq. 

 Communicated by Sir John Herschel. 



18. Extract of a Letter from Lieut.-Colonel Harvey, 14th Light 

 Dragoons, dated Poona, March 13. Communicated by Professor 

 Narrien. 



Distance from. 



LVIII. Intelligence and Miscellaneous Articles. 



ON THE COMPOSITION OF PECHBLENDE. BY M. EBELMAN. 



THE author remarks that the uranium in this mineral has hitherto 

 been regarded as identical with the olive-green oxide of uranium, 

 which before the experiments of M. Peligot was considered to be 

 the protoxide ; but it is to be remarked, M. Ebelman observes, that 

 pechblende, even when reduced to very fine powder, retains its deep 

 black colour, as it also does when heated in a current of azote to 

 deprive it of water, whereas if heated to redness in atmospheric air 



