NO. 48 —1897.] GEOLOGY AND MINERALOGY. 67 



Cochran from Dana's " Mineralogy," Ceylon plumbago does 

 not appear to the best advantage, being in all probability 

 not represented by a very good local sample :— 







Specific 

 Gravity. 



Carbon. 



Volatile 

 Matter. 



A all 



Asn. 



Ural, Mt. Alibert 



... 



24759 



94-03 



0-72 



5-25 



Cumberland, England 





2-3455 



91-55 



1-10 



7-35 



Mugran, Bohemia 

 Zaptan, Lower Austria 





2-1197 



91-05 



4-10 



4-85 





2-2179 



90-63 



2-20 



7-17 



Savarbock, Bohemia 





2-3438 



88-05 



1-05 



10-90 



Fagerita, Sweden 





2-1092 



87-65 



1-55 



10-80 



Cumberland 





2-5857 



84-38 



2-62 



13-00 



Passan, Bavaria 





2-3032 



81-08 



7-30 



11-62 



Buckingham, Canada 





2-2863 



78-48 



1-82 



19-70 



Cumberland 





2-4092 



78-10 



6-10 



15-80 



Ceara, Brazil ... 





2-3865 



77-15 



2-55 



20-30 



Passan, Bavaria 





2-3108 



73-65 



4-20 



22-15 



Madagascar 





2-4085 



70-69 



5-18 



24-13 



Ceylon 





2-2659 



68-30 



5-20 



26-50 



Pissie, Nantes- Alpes 





2-4572 



59-67 



3-20 



3713 





Composition of 100 Parts of Ash. 





Silica. 



Alumina. 



Oxide of 

 Iron. 



Magnesia 

 and Lime. 



Alkalies 

 and loss. 



Ural, Mt. Alibert 



64-2 



24-7 



10-0 



0-8 



0-3 



Cumberland, England ... 



52-5 



28-3 



12-0 



6-0 



1-2 



Mugran, Bohemia 



61-8 



28-5 



8-0 



0-7 



1-0 



Zaptan, Lower Austria... 



55-0 



30-0 



14-3 





0-7 



Savarbock, Bohemia 



62-0 



28-5 



6-3 



1-5 



1-7 



Fagerita, Sweden 



58-6 



31-5 



7-2 



05 



2-2 



Buckingham, Canada ... 



65-0 



25-1 



6-2 



0-5 



1-2 



Cumberland 



62-0 



25-0 



10-0 



2-6 



0-4 



Passan, Bavaria 



53-7 



35-6 



6-8 



1-7 



2-2 



Cumberland 



58-5 



30-5 



7-5 



3-5 





Ceara, Brazil 



79-0 



11-7 



7-8 



1-5 





Passan, Bavaria 



69-5 



211 



5-5 



2-0 



1-9 



Madagascar 



59-6 



31-8 



6-8 



1-2 



0-6 



Ceylon 



50-3 



41-5 



8-2 







Pissie, Nantes-Alpes 



68-7 



20-8 



8, 



1-5 



0-9 



The following analyses of Canadian and Ceylon graphites, 

 reproduced from the "Mineral Resources of the United 

 States," by Mr. J. A. Walker, and quoted by Mr. Ferguson 



F 2 



