lS2o.] Specimens of the Soil of the Cavern of Kuhloch. 289 



with tepid water, filtered, and 

 calcined, exhaled a slight sul- 

 phureous odour ; it had a red- 

 dish yellow colour, and weighed 

 O'oOo gr. 



a. Precipitate of No. 7. a. Precipitate of No. 7. 



8. 0*2 gr. of this precipitate 8. 0'33o gr. of this precipi- 

 gave no indications of manga- tate gave with potash a sensi- 

 nese by fusion with potash, ble quantity of oxide of man- 

 The residuum dissolved in nitric ganese ; the alumina, if it con- 

 acid, and treated with solution tained any, was in extremely 

 of potash, gave no alumina to small quantity. 



the alkali. 



9. 0-225 gr. of the same pre- 9. 0-3 gr. of precipitate (7) 

 cipitate, treated with sulphuric similarly treated. 



acid and alcohol, gave a resi- 

 duum and an alcoholic solution. 



10. The residuum consisted 10. Residuum wholly formed 

 of sulphate of lime 0'275 gr. of sulphate of lime = 0*326 gr. 

 magnesia 0*010 gr. 



11. The alcoholic solution 11. Alcoholic solution, simi- 

 was mixed with water, and larly treated. 



slowly concentrated, and the 

 residuum diluted with water, 

 precipitated by ammonia, and 

 tillered. 



The filtered liquid evapo- Filtered liquid, same reaultH. 

 rated to dryness left phos- 

 phoric acid, whose nature was 

 ascertained by means of oxide 

 of silver and oxide of lead. 



The precipitate dried in the Precipitate dried it/ the air 

 air weighed 0*1 gr. ; heated = 0*07o gr. exposed to 212°, 

 to 212° water and ammonia gave oft' water and ammonia; 

 were disengaged ; it dissolved carbonate of potash took up 

 entirely after calcination in phosphoric acid, and left a re- 

 weak sulphuric acid ; the solu- siduum consisting of magnesia, 

 tion, treated with boiling sub- peroxide of iron, and oxide of 

 carbonate of potash in excess, manganese, 

 yield ttocculi of carbonate of 

 magnesia, and peroxide of iron ; 

 the alkaline liquid probably 

 contained phosphoric acid ; 

 neutralized l)y nitric acid and 

 evaporated to dryness, a mi- 

 nute portion of matter remained 

 of a light rose colour. 



New Series, vol.. i\. u 



