386 Indian Graphite. 



chard Moyle, Esq. — Council : George S. Borlase, Esq. ; Jo- 

 seph Carne, Esq. ; Stephen Davey, Esq. ; Richard Edmonds, 

 Esq. ; Robert W. Fox, Esq. ; George Grenfell, Esq. ; Hum- 

 phry Grylls, Esq.; George D. John, Esq.; William M. 

 Tweedy, Esq. ; Michael Williams, Esq. 



LX. Intelligence and Miscellaneous Articles. 



INDIAN GRAPHITE. 



'HE following account of the graphite of the Himalaya was 



lately read before the Asiatic Society of Bengal. 

 Dr. Abel observes, that the plumbago of mineralogists is 

 divided into two species, the scaly and compact ; their names 

 depending on the relative size of the grains disclosed on their 

 fracture, or, according to Mohs, " the former comprehending 

 those which are still discernible, while in the latter they are 

 withdrawn from observation." According to this definition, 

 the Himalayan mineral belongs to the order of compact gra- 

 phites. 



The Himalayan graphite is found on the surface of a hill 

 composed of highly carburetted mica slate, a locality which 

 corresponds with that of Aberdeenshire and other countries, 

 according to Mohs, Jameson, and other mineralogists. 



Graphite varies so much in specific gravity, that it is im- 

 possible to take its w r eight as a perfect criterion of its purity: 

 the lowest specific gravity of the specimens examined by Dr. 

 Abel was 2-268, and the highest 2-488. 



The following list is given, by Dr. A. of the specific gravity 

 of the graphite, by various authors, as well as from various 

 countries : — 



Kirwan 1-987 to 2*267 



Brisson 2-150 .. 2-456 



Henry 2-089 .. 2-246 



Ure and Jameson 1*9 .. 2-4 



Thomson 1-987 .. 2-267 



Thenard 2-08 .. 2-26 



Borrowdale graphite, in Dr. A.'s possession 2-267 



Spanish ditto ditto 1*379 • 



Ava ditto ditto 2-246 



Ceylon ditto ditto 2-000 



Himalayan ditto, No. 1, 2*268 



2, 2-375 



3, 2-463 



4, 2-488 



Although 



