with the Prussiate of Potash. 219 



8. The composition of the salt may therefore be stated as 

 follows : 



1 atom anhydrous prussiate of potash, 23-25^ 

 i ... chlorine, = 2-25J 



or, *-.""*'""" *"'" Mn .r- J Pw s " 



Per Cent. 



Chlorine, atom, = 2'25 = 8'8235~) 

 Cyanogen, 3 atoms, = 975 = 38-2353 J ~~ 

 Iron, 1 ... = 3-5 = 13725 



Potassium, 2 ... = lO'O rz 39'215 



25-5 99'99 



or, by doubling the quantities, we shall get rid of the half atom, 

 and the atomic weight will be 51. 



In this statement, the sum of the chlorine and cyanogen ap- 

 proaches very near to the amount of cyanogen assigned by GME- 

 LIN : in the potassium there is a difference of 4 and in the iron 

 of 3 per cent. 



9. There are three different modes of combination, according 

 to which the chlorine may be supposed to have arranged its ele- 

 mentary particles in forming the new compound we have been 

 considering. Either it may have united with the cyanogen con- 

 tained in the cyanide of iron, forming a chloro-cyanide, in which 

 the acid consists of 



1 Chlorine, = 4'5"l 



= 4-5") 

 , =6-5) 



2 Cyanogen 



united to two atoms of iron. Or it may have united itself to 

 that which is combined with the potassium, forming an acid con- 

 taining double the quantity of cyanogen, namely, 



62 



