196 A SYSTEM OF 



;. The fame calx, when precipitated from 

 acids, by means of the fixed alcaii, is of a 

 greehifti colour •, but it becomes bine, when 

 precipitated by means of an alcaii united 

 with phlogifton, in which tail circum- 

 ftance the phlogifton unites with the iron : 

 Thefe two precipitates lofe their colour in 

 the lire, and turn brown. 



k. The vitriol of iron is green. 



/. It is the mofb common metal in nature, 

 and at the fame time the moft ufeful in 

 common life -, notwithftanding which, its- 

 qualities are perhaps very little known. 



SECT. CCIL 



Iron is found, 

 A. In form of calx, Minera ferri cakiformis 

 pura. 

 i. Pure. 

 a. Loofe and friable, Minera ferri cakifor- 

 mis pur a friabilis. Martial ochre, Mine- 

 ra ochracea. 



i. Powdry, Ochra ferri^ is commonly 

 yellow or red, and is iron which has 

 been diftbived by the vitriolic acid. 

 2 Concreted. Bog-ore. 



a. h\ form of round porous balls. 

 /-. More folic} balls. 



c. In fmall flat pieces, like cakes, of 

 pieces of money. 



d. In fmall grains. 



e. In lumps of an indeterminate 

 figure. 



Ail thefe are of a blackifh brown, 

 or a light brown colour. TJiey are 

 found in lakes in the province of 



Smoiand \ 



