Molybdetifa 



12. It is itfelf precipitated from the ni- 

 trous acid in the form of a brown calx by 

 zinc and iron. Copper feems to precipitate 

 only a little dephlogifticated iron from it, to 

 which a little of the white calx is united; 

 lead alfo produces the fame effect. 



13. It does not detonate with nitre, though 

 it alkalizes it, and is dephlogifticated by it. 



14. It does not unite with fulphur. 



15. It fublimes with fal ammoniac, and 

 takes a yellow colour. 



1 6. It does not amalgamate with mercury, 

 but when in fufion it unites with iron, cop- 

 per, or cobalt, but not with any other me- 

 tal, except perhaps nickel, which has not 

 been tried $ it converts bar iron into the ftate 

 of crude or caft iron, and when in a fmaller 

 proportion renders it.cotdjhort. 



CHAP* XXIL 



Molybdena. Molybdena membranacea Cronft* 

 1 J4 Wafferbley of the Germans. 



I. It refembles plumbago, but its laminae 



are larger, brighter, and when thin flightly 



flexible ; it is of a lead colour, and does not 



A a 3 ftrike 



