ANALYSIS OF HUMAN BONES. Q^g 



means of muriate of ammonia, wash it, and examine by Method of 

 the usualmeans whether it be really alumine. analysis. 



7. Dry the magnesia, iron, and manganese, from which 

 the phosphoric acid and alumina have been separated by 

 the potash. Calcine them a long time in a platina crucible, 

 and pour on them sulphuric acid diluted with water, till 

 there is a slioht excess of it. 



This will dissolve the magnesia, and a portion of the iroDj. 

 but not touch the manganese. 



8. Evaporate the solutiot> of magnesia containing' iron, 

 and calcine it strongly: the iron will be separated, and the 

 magnesia, on the contrary, will remain united with the sul- 

 phuric acid. Dissolve in water, and the iron will be ob- 

 tained in the state of red oxide. Precipitate the magnesia 

 by carbonate of potash, and ascertain its purity by the usual 

 methods. 



9. Add the iron of the preceding operation to the manga* 

 nese of experiment 7, and dissolve them both in an exee^a 

 of muriatic acid. Dilute the solution with water, and add 

 carbonate of potash, till a red flocculent precipitate sepa- 

 parates, and the liquid becomes clear and colourless. 



- These flocks are oxide of iron. Let them be separated 

 by filtration, and boil the liquor in a matrass. After some 

 time, the manganese will fall down in a white powder, and 

 when the liquor lets fall nothing more, and potash produces 

 no effect on it, separate the manganese by liltration. Cal- 

 cine it, and it will become black. 



Thus the alumine, magnesia, iron, and manganese, hav- 

 ing been separated by the means just described, nothing 

 remains to be done but to find the silex. 



10. For this purpose evaporate the liquor containing the 

 phosphate and sulphate of ammonia of experiments 3 and 4. 

 As it concentrates, tolerably bulky black flocks are formed, 

 which must be separated from time to time by filtration; 

 and when the salt is thoroughly dry, it is to be dissolved 

 in water, and a little more of the same biack matter will 

 be obtained, 



11. Wash this flocculent matter, calcine it in a platina 

 crucible, and a white powder will be obtained^ ppssessiog aJI 

 the properties of sjlex, 



S 3 Duriuj^ 



