322 rnoTOSALTs 



This approaches 



1 atom phosphoric acid 3*5 



1 atom protoxide of iron 4-5 



2 atoms water 2-25 



10-25 



But this differs a good deal from the result of 

 Laugier's analysis of the crystals. 



The phosphate of iron, which occurs in fine 

 transparent blue crystals, was analyzed by Stro- 

 meyer, and found composed of 



Phosphoric acid . 2 -J3 

 Protoxide of iron . 3-64 

 Water 2-42 



8-79* 



This is obviously 



1 atom phosphoric acid 3-5 



1 atom protoxide of iron 4-5 



3 atoms water . . 3 -3 7 5 



11-375 



e- 5. Dipi'otarseniate of iron. This salt is found 

 native, crystallized in small cubes, which have 

 a dark green colour, and a specific gravity of 

 3. It may be formed artificially by mixing to- 

 gether solutions of arseniate of ammonia and pro- 



* Untersuchungen, I. p. ?74. 



