OF IRON OF NEW JERSEY. 85 



into peroxide. It weighed 3.78 grammes: as no other 

 volatile matter exists in the bine iron earth but water, 

 the quantity of it ought to equal this loss, (1.22 

 grammes) and the difference between the protoxide 

 of the mineral and the tritoxide obtained by the ana- 

 lysis, which is 0.193 gramme ; together 1.413 

 grammes. 



Hence we have for result, 



grammes or per ct. 



Protoxide of Iron . . 



2.2270 . 



. 44.54> 



Phosphoric Acid . . 



1.2926 . 



. 25.85 



Water ..... 



1.4130 . 



. 28.26 



xVlumine .... 



0.0200 ■ 



• 0.40 



Loss ..... 



0.0474 . 



. 0.95 



5.0000 100.00 

 To show that the precipitate obtained with the mu- 

 riate of lime, really contained an acid with a base of 

 phosphorus, it was dissolved in nitric acid, then de- 

 composed by oxalate of ammonia, which threw down 

 the lime ; this product was removed by filtering, the 

 liquor was evaporated to dryness, then calcined at a 

 red heat in a platina crucible; nothing remained but a 

 vitreous matter, slightly soluble in water, of an acid 

 taste, and reddening litmus paper; it resembled 

 glacial Phosplwric acid. This acid, exposed to a 

 red heat with charcoal in a coated glass tube, gave 

 Phosphorus ; hence, no doubt can exist as to this 

 mineral being a phosphate of iron. 



Lately this mineral has been re-examined, with 



