OF IRON. 321 



culated from 5i grains of carbonate obtained 

 during the experiment. Bucholz estimated it at 

 2-5 grains, but the true quantity is obviously 3 

 grains. The protoxide of iron was the quantity 

 requisite to make up the 100 grains analyzed. 

 Now, if the salt were a compound of 



1 atom carbonic acid . 2-?5 or 36 



1 atom protoxide of iron 4-5 - 59 



,7-25 



we obtain the very constituents of Bucholz. 

 The lime, consequently, must have been acci- 

 dentally present, and not in the state of combi- 

 nation. The water, amounting only to ith atom, 

 must have been mechanically mixed. 



4. Protophosphate of iron. This salt, in beau- 

 tiful transparent crystals of a light blue colour, p 

 and having the shape of right oblique prisms, 

 has been found in Cornwall, and likewise in 

 Brazil and the Isle of France. A variety from 

 Eckartsberg, in round nodules, and not crystal- 

 lized, was analyzed by Klaproth, who found its 

 constituents 



Phosphoric acid . 32 

 Protoxide of iron . 47 "5 

 Water 20 



99-5* 



- Hfitrage, IV. 

 VOL. II. X 



