1825.] Specimens of the Soil of the Cavern ofKuhloch. 291 



Grammes. 



Water, and matter vola- 

 tile at 250° 0-185 



Matter volatilized by 

 combustion and a red 

 heat 0-165 



c J r Silica 0-159 



^^"^y J Alumina 0-026 



"^r^' \ Peroxide of iron 0-013 



*^"""^' LLime.. 0-005 



Phosphates of lime "j 



magnesia > 0-505 



iron ? J 



Grammes. 



Water, and matter vola- 

 tile at 250° 0-215 



Matter volatilized by 

 coiTibustion and a red 



heat 0-200 



Silica 0-185 



^^"^y /Alumina 0-040 



"^f^^- S Peroxide ofiron 0-01 3 

 ^""°^- iLime.... 

 Phosphates of lime 



0-002 



magnesia 



iron 



Carbonate of lime. 



0-624 

 0-268 

 Sulphate of lime 0-024 



manganese 



] 



0-635 



magnesia , 



Carbonate of lime 0-459 



0-124 



magnesia. 



Sulphate of hme 0-027 



Silica 0-020 



Loss 



1-974 

 0-026 



2-000 



Loss 



1-920 

 80 



2-000 



16. The loss mustbe rather greater in reahty than is indicated 

 in the preceding tables, because the carbonates of lime and 

 magnesia must have lost a portion of their carbonic acid by cal- 

 cination ; but the effervescence produced during the solution of 

 the calcined matters in nitric acid (3) and (3), proves that the 

 whole of the carbonic acid had not been volatilized by the cal- 

 cination. I should add, that I looked in vain for fluoric acid in 

 the soil of the cavern ofKuhloch. 



§ 2. Series of Experiments to determine the Nature of the Matter 



of Specimens A and B tohich is alterable by Heat. 



Experiments on Specimen A. Experiments on Specimen B. 



17. 10 parts of the specimen 17. 10 parts of the specimen 

 A were treated at least 20 B treated in the same manner 

 times with 100 parts of water at gave a residuum weighing 1-33 

 each operation. The first part, which differed from the 

 washings were made at the preceding only in being of a 

 temperature of 140° to 176° more red orange colour, and 

 Fahr. ; the last were at the containing -a little more deli- 

 boiling point. The washings quescent matter. The matter 

 mixed and evaporated left an insoluble in boiling water will 

 orange coloured precipitate be examined in Article 2. 

 weighing 0-66 parts. The 



matter insoluble in boiUng 

 water will be examined in Arti- 

 cle 2. u 2 



